Do not define __NO_STRICT_ALIGNMENT for armv6. While the requirements

are no longer natural-alignment strict, there are still some restrictions.

FreeBSD network code assumes data is naturally-aligned or is running
on a platform with no restrictions; pointers are not annotated to
indicate the data pointed to may be packed or unaligned.  The clang
optimizer can sometimes combine the load or store of a pair of adjacent
32-bit values into a single doubleword load/store, and that operation
requires at least 4-byte alignment.  __NO_STRICT_ALIGNMENT can lead
to tcp headers being only 2-byte aligned.

Note that alignment faults remain disabled on armv6, this change reverts
only the defining of the symbol which leads to some overly-agressive code
shortcuts when building common/shared drivers and network code for arm.

Approved by:	re(kib)

sys/arm/include/_types.h

@@ -43,10 +43,6 @@
 #error this file needs sys/cdefs.h as a prerequisite
 #endif
 
-#if __ARM_ARCH >= 6
-#define __NO_STRICT_ALIGNMENT
-#endif
-
 /*
  * Basic types upon which most other types are built.
  */