meson: only enable SSE2 on x86_64
Now SSE2 is enabled for 32-bit x86 (with recent GCC). It's causing issues
such as
@@ -264,9 +264,9 @@ graphene_simd = []
sse2_cflags = []
if get_option('sse2')
sse_prog = '''
-#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9))
+#if defined(__GNUC__)
# if !defined(__amd64__) && !defined(__x86_64__)
-# error "Need GCC >= 4.9 for SSE2 intrinsics on x86"
+# error "SSE2 intrinsics are only available on x86_64"
# endif
#elif defined (_MSC_VER) && !defined (_M_X64) && !defined (_M_AMD64)
# error "SSE2 intrinsics not supported on x86 MSVC builds"
