Build: Remove ARMv6 support from 'make iosdmg'

The last iDevice to require ARMv6 was the iPhone 3G, which required iOS
4.2.1 or older.  Our binaries have always required iOS 4.3 or newer,
so I'm not sure if the ARMv6 fork of our binaries was ever useful to
begin with.  In any case, if it ever was useful, it no longer is.  Fat
binaries can still be generated with ARMv6 support by invoking
{build_directory}/pkgscripts/makemacpkg manually.

BUILDING.md

@@ -323,11 +323,6 @@ Set the following shell variables for simplicity:
     IOS_SYSROOT=$IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk
     IOS_GCC=$IOS_PLATFORMDIR/Developer/usr/bin/arm-apple-darwin10-llvm-gcc-4.2
 
-  *ARMv6 (code will run on all iOS devices, not SIMD-accelerated)*  
-  [NOTE: Requires Xcode 4.4.x or earlier]
-
-    IOS_CFLAGS="-march=armv6 -mcpu=arm1176jzf-s -mfpu=vfp"
-
   *ARMv7 (code will run on iPhone 3GS-4S/iPad 1st-3rd Generation and newer)*
 
     IOS_CFLAGS="-march=armv7 -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon"
@@ -399,8 +394,8 @@ NOTE:  You can also add `-miphoneos-version-min={version}` to `$IOS_CFLAGS`
 above in order to support older versions of iOS than the default version
 supported by the SDK.
 
-Once built, lipo can be used to combine the ARMv6, v7, v7s, and/or v8 variants
-into a universal library.
+Once built, lipo can be used to combine the ARMv7, v7s, and/or v8 variants into
+a universal library.
 
 
 ### Building libjpeg-turbo for Android
@@ -782,7 +777,6 @@ default, but you can override this by setting the `BUILDDIR32` variable on the
 make command line as shown above.
 
     make iosdmg [BUILDDIR32={32-bit build directory}] \
-      [BUILDDIRARMV6={ARMv6 build directory}] \
       [BUILDDIRARMV7={ARMv7 build directory}] \
       [BUILDDIRARMV7S={ARMv7s build directory}] \
       [BUILDDIRARMV8={ARMv8 build directory}]
@@ -791,19 +785,17 @@ On OS X systems, this creates a Macintosh package and disk image in which the
 libjpeg-turbo static libraries contain ARM architectures necessary to build
 iOS applications.  If building on an x86-64 system, the binaries will also
 contain the i386 architecture, as with `make udmg` above.  You should first
-configure ARMv6, ARMv7, ARMv7s, and/or ARMv8 out-of-tree builds of
-libjpeg-turbo (see "Building libjpeg-turbo for iOS" above.)  If you are
-building an x86-64 version of libjpeg-turbo, you should configure a 32-bit
-out-of-tree build as well.  Next, build libjpeg-turbo as you would normally,
-using an out-of-tree build.  When it is built, run `make iosdmg` from the
-build directory.  The build system will look for the ARMv6 build under
-*{source_directory}*/iosarmv6 by default, the ARMv7 build under
-*{source_directory}*/iosarmv7 by default, the ARMv7s build under
-*{source_directory}*/iosarmv7s by default, the ARMv8 build under
-*{source_directory}*/iosarmv8 by default, and (if applicable) the 32-bit build
-under *{source_directory}*/osxx86 by default, but you can override this by
-setting the `BUILDDIR32`, `BUILDDIRARMV6`, `BUILDDIRARMV7`, `BUILDDIRARMV7S`,
-and/or `BUILDDIRARMV8` variables on the `make` command line as shown above.
+configure ARMv7, ARMv7s, and/or ARMv8 out-of-tree builds of libjpeg-turbo (see
+"Building libjpeg-turbo for iOS" above.)  If you are building an x86-64 version
+of libjpeg-turbo, you should configure a 32-bit out-of-tree build as well.
+Next, build libjpeg-turbo as you would normally, using an out-of-tree build.
+When it is built, run `make iosdmg` from the build directory.  The build system
+will look for the ARMv7 build under *{source_directory}*/iosarmv7 by default,
+the ARMv7s build under *{source_directory}*/iosarmv7s by default, the ARMv8
+build under *{source_directory}*/iosarmv8 by default, and (if applicable) the
+32-bit build under *{source_directory}*/osxx86 by default, but you can override
+this by setting the `BUILDDIR32`, `BUILDDIRARMV7`, `BUILDDIRARMV7S`, and/or
+`BUILDDIRARMV8` variables on the `make` command line as shown above.
 
 NOTE: If including an ARMv8 build in the package, then you may need to use
 Xcode's version of lipo instead of the operating system's.  To do this, pass

Makefile.am

@@ -760,12 +760,12 @@ udmg: all pkgscripts/makemacpkg pkgscripts/uninstall
 	sh pkgscripts/makemacpkg -build32 ${BUILDDIR32}
 
 iosdmg: all pkgscripts/makemacpkg pkgscripts/uninstall
-	sh pkgscripts/makemacpkg -build32 ${BUILDDIR32} -buildarmv6 ${BUILDDIRARMV6} -buildarmv7 ${BUILDDIRARMV7} -buildarmv7s ${BUILDDIRARMV7S} -buildarmv8 ${BUILDDIRARMV8} -lipo "${LIPO}"
+	sh pkgscripts/makemacpkg -build32 ${BUILDDIR32} -buildarmv7 ${BUILDDIRARMV7} -buildarmv7s ${BUILDDIRARMV7S} -buildarmv8 ${BUILDDIRARMV8} -lipo "${LIPO}"
 
 else
 
 iosdmg: all pkgscripts/makemacpkg pkgscripts/uninstall
-	sh pkgscripts/makemacpkg -buildarmv6 ${BUILDDIRARMV6} -buildarmv7 ${BUILDDIRARMV7} -buildarmv7s ${BUILDDIRARMV7S} -buildarmv8 ${BUILDDIRARMV8} -lipo "${LIPO}"
+	sh pkgscripts/makemacpkg -buildarmv7 ${BUILDDIRARMV7} -buildarmv7s ${BUILDDIRARMV7S} -buildarmv8 ${BUILDDIRARMV8} -lipo "${LIPO}"
 
 endif