https://bugs.gentoo.org/show_bug.cgi?id=395615

Explicitly add the required -m32/m64 to *FLAGS; this overrides any 
arch-specific -m* flags that may have been appended by multilib-portage.

Even though -m32/m64 is now added to *FLAGS, -m32/m64 still has to be
explicitly added to CC and CXX due to wine's build system. For example,
winegcc saves the build-time value of CC and uses it at runtime.

--- a/configure.ac	2016-03-05 20:53:50.574628728 -0500
+++ b/configure.ac	2016-03-05 20:57:54.945617833 -0500
@@ -141,6 +141,9 @@
     then
       CC="$CC -m32"
       CXX="$CXX -m32"
+      CFLAGS="$CFLAGS -m32"
+      LDFLAGS="$LDFLAGS -m32"
+      CXXFLAGS="$CXXFLAGS -m32"
       AC_MSG_CHECKING([whether $CC works])
       AC_LINK_IFELSE([AC_LANG_PROGRAM()],AC_MSG_RESULT([yes]),
                      [AC_MSG_RESULT([no])
@@ -160,6 +163,9 @@
       fi
       CC="$CC -m64"
       CXX="$CXX -m64"
+      CFLAGS="$CFLAGS -m64"
+      LDFLAGS="$LDFLAGS -m64"
+      CXXFLAGS="$CXXFLAGS -m64"
       host_cpu="x86_64"
       notice_platform="64-bit "
       AC_SUBST(TARGETFLAGS,"-m64")