allow on combinations of GHC 8.2 & Windows (#407)

* finer GNU C version check

Author: kakkun61

cbits/measure_off.c

@@ -37,7 +37,7 @@
 
 #if defined(__x86_64__) && defined(COMPILER_SUPPORTS_AVX512)
 bool has_avx512_vl_bw() {
-#if __GNUC__ >= 6 || defined(__clang_major__)
+#if (__GNUC__ >= 7 || __GNUC__ == 6 && __GNUC_MINOR__ >= 3) || defined(__clang_major__)
   uint32_t eax = 0, ebx = 0, ecx = 0, edx = 0;
   __get_cpuid_count(7, 0, &eax, &ebx, &ecx, &edx);
   // https://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features