* elf/dl-sysdep.c (_dl_important_hwcaps): Add integer overflow check.

* elf/dl-sysdep.c (_dl_important_hwcaps): Add integer overflow check.

	* elf/dl-minimal.c (__libc_memalign): Likewise.  Handle malloc (0).
	Return NULL if mmap failed instead of asserting it does not.
	(calloc): Check for integer overflow.

	* elf/dl-minimal.c (__strtoul_internal): Fix parsing of numbers bigger
	than LONG_MAX / 10.