tests/basic: perform x86 vector cluttering only when SSE2 is set
* tests/basic.c (CLUTTER_VECTOR_REGISTER_AMD64) (CLUTTER_VECTOR_REGISTER_I386): Set only if __SSE2__ defined. (clutter_vector_registers) [CLUTTER_VECTOR_REGISTER_AMD64]: Remove __SSE2__ check for "xmm" clobbers. (clutter_vector_registers) [CLUTTER_VECTOR_REGISTER_I386]: Likewise.
Force SSE2 check as buggy compiler might not define SSE2 but
still attempt to use XMM registers.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>