* libc/machine/arm/aeabi_memcpy.c: New file.
	* libc/machine/arm/aeabi_memcpy-armv7a.S: New file.
	* libc/machine/arm/Makefile.am: Add dependencies.
	* libc/machine/arm/Makefile.in: Regenerated.
	* libc/time/clock.c (clock): Fix warnings about signed-unsigned
	comparisons.
	* libc/time/strftime.c (strftime): Likewise.
	* libc/time/strptime.c (match_string): Fix warning about discarding
	'restrict' qualifier from pointer target type.
Add missing libc/machine/arm/aeabi_memcpy-armv7a.S file
	* libc/time/mktm_r.c (_mktm_r): Optimize speed.