Remove SVR4 (System V Release 4) binary compatibility support.

UNIX System V Release 4 is operating system released in 1988. It ceased
to exist in early 2000-s.

ObsoleteFiles.inc

@@ -38,6 +38,11 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20170226: SVR4 compatibility removed
+.if ${TARGET_ARCH} == "amd64" || ${TARGET_ARCH} == "i386"
+OLD_FILES+=usr/share/man/man4/streams.4
+OLD_FILES+=usr/share/man/man4/svr4.4
+.endif
 # 20170219: OpenPAM RADULA upgrade removed the libpam tests
 OLD_FILES+=usr/tests/lib/libpam/Kyuafile
 OLD_FILES+=usr/tests/lib/libpam/t_openpam_ctype

etc/defaults/rc.conf

@@ -630,7 +630,6 @@ firstboot_sentinel="/firstboot"	# Scripts with "firstboot" keyword are run if
 # Emulation/compatibility services provided by /etc/rc.d/abi
 sysvipc_enable="NO"	# Load System V IPC primitives at startup (or NO).
 linux_enable="NO"	# Linux binary compatibility loaded at startup (or NO).
-svr4_enable="NO"	# SysVR4 emulation loaded at startup (or NO).
 clear_tmp_enable="NO"	# Clear /tmp at startup.
 clear_tmp_X="YES" 	# Clear and recreate X11-related directories in /tmp
 ldconfig_insecure="NO"	# Set to YES to disable ldconfig security checks

etc/rc.d/abi

@@ -43,25 +43,18 @@ linux_start()
 	fi
 }
 
-svr4_start()
-{
-	echo -n ' svr4'
-	load_kld -m svr4elf svr4
-}
-
 abi_start()
 {
 	local _echostop
 
 	_echostop=
-	if checkyesno sysvipc_enable || checkyesno linux_enable || checkyesno svr4_enable; then
+	if checkyesno sysvipc_enable || checkyesno linux_enable; then
 		echo -n 'Additional ABI support:'
 		_echostop=yes
 	fi
 
 	checkyesno sysvipc_enable && sysv_start
 	checkyesno linux_enable && linux_start
-	checkyesno svr4_enable && svr4_start
 
 	[ -n "${_echostop}" ] && echo '.'
 }

lib/libc/regex/re_format.7

@@ -319,7 +319,7 @@ The additional word delimiters
 and
 .Ql \e>
 are provided to ease compatibility with traditional
-.Xr svr4 4
+SVR4
 systems but are not portable and should be avoided.
 .Pp
 In the event that an RE could match more than one substring of a given

share/man/man4/man4.i386/Makefile

@@ -25,8 +25,6 @@ MAN=	aic.4 \
 	pnpbios.4 \
 	sbni.4 \
 	smapi.4 \
-	streams.4 \
-	svr4.4 \
 	vpd.4 \
 	vx.4
 

share/man/man5/rc.conf.5

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 10, 2016
+.Dd February 26, 2017
 .Dt RC.CONF 5
 .Os
 .Sh NAME
@@ -3631,11 +3631,6 @@ Set to
 .Dq Li YES
 to enable Linux/ELF binary emulation at system initial
 boot time.
-.It Va svr4_enable
-.Pq Vt bool
-If set to
-.Dq Li YES ,
-enable SysVR4 emulation at boot time.
 .It Va sysvipc_enable
 .Pq Vt bool
 If set to