Change order of CFLAGS for SSE tests
This makes the configure tests for SSE support fail if CFLAGS specify -mno-sse2 or/and -mno-sse4.1. Fixes #4363 (closed).
This makes the configure tests for SSE support fail if CFLAGS specify -mno-sse2 or/and -mno-sse4.1. Fixes #4363 (closed).