Disable AES-NI support if as does not support SSSE3.
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Description

Disable AES-NI support if as does not support SSSE3.

* configure.ac (HAVE_GCC_INLINE_ASM_SSSE3): New test.
(ENABLE_AESNI_SUPPORT): Do not define without SSSE3 support.
(HAVE_GCC_INLINE_ASM_SSSE3, ENABLE_AVX_SUPPORT): Split up detection
and definition.

For example the assembler of FreeBSD 7.3 does not know about pshufb
and thus rijndael.c can't be compiled without using
--disable-aesni-support. This check that the toolchain can use SSSE3
instructions before trying to build with AES_NI support.