Mingw-w64 workaround

nim.cfg

@@ -14,6 +14,9 @@
   @if i386:
     # set the IMAGE_FILE_LARGE_ADDRESS_AWARE flag so we can use PAE, if enabled, and access more than 2 GiB of RAM
     --passL:"-Wl,--large-address-aware"
+  @else
+    # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65782
+    --passC:"-fno-asynchronous-unwind-tables"
   @end
 
   # The dynamic Chronicles output currently prevents us from using colors on Windows