Merge pull request #1802 from martin-frbg/issue1801

Use avx512 workaround with msys2/mingw64 as well

Author: martin-frbg

Makefile.x86_64

@@ -15,6 +15,11 @@ FCOMMON_OPT += -march=skylake-avx512
 ifeq ($(OSNAME), CYGWIN_NT)
 CCOMMON_OPT += -fno-asynchronous-unwind-tables
 endif
+ifeq ($(OSNAME), WINNT)
+ifeq ($(C_COMPILER), GCC)
+CCOMMON_OPT += -fno-asynchronous-unwind-tables
+endif
+endif
 endif
 endif