cmake: try baseline optimization feature check without extra flags first

cmake/checks/cpu_sse2.cpp

@@ -1,2 +1,16 @@
 #include <emmintrin.h>
-int main() { return 0; }
+
+inline __m128i _v128_comgt_epu32(const __m128i& a, const __m128i& b)
+{
+    const __m128i delta = _mm_set1_epi32((int)0x80000000);
+    return _mm_cmpgt_epi32(_mm_xor_si128(a, delta), _mm_xor_si128(b, delta));
+}
+
+int main()
+{
+    __m128i a, b, c;
+    a = _mm_set1_epi32(0x00000000);
+    b = _mm_set1_epi32(0x0000ffff);
+    c = _v128_comgt_epu32(a, b);
+    return 0;
+}