Bug 1576474 - Remove a configure option for mingw-gcc which we no longer support r=dmajor

Differential Revision: https://phabricator.services.mozilla.com/D43356

--HG--
extra : moz-landing-system : lando

old-configure.in

@@ -846,9 +846,6 @@ case "$target" in
             CFLAGS="$CFLAGS -mstackrealign"
             CXXFLAGS="$CXXFLAGS -mstackrealign"
             LDFLAGS="$LDFLAGS -Wl,--large-address-aware"
-            if test -z "$CLANG_CC"; then
-                LDFLAGS="$LDFLAGS -Wl,--enable-stdcall-fixup"
-            fi
         else
             DSO_LDOPTS="$DSO_LDOPTS -MACHINE:X86"
             LDFLAGS="$LDFLAGS -SAFESEH"