Apply MinGW AVX512 compilation fix to fortran options as well

original issue was #1708, I see now that the same problem affects gfortran compilation. The underlying issue is said to be fixed (but not yet released) on all branches of gcc as of a few days ago but it will certainly take time to reach mingw/msys.

Makefile.x86_64

@@ -15,10 +15,12 @@ CCOMMON_OPT += -march=skylake-avx512
 FCOMMON_OPT += -march=skylake-avx512
 ifeq ($(OSNAME), CYGWIN_NT)
 CCOMMON_OPT += -fno-asynchronous-unwind-tables
+FCOMMON_OPT += -fno-asynchronous-unwind-tables
 endif
 ifeq ($(OSNAME), WINNT)
 ifeq ($(C_COMPILER), GCC)
 CCOMMON_OPT += -fno-asynchronous-unwind-tables
+FCOMMON_OPT += -fno-asynchronous-unwind-tables
 endif
 endif
 endif