restore original logic for setting MOZ_NO_WALLET_HACK which I believe was correct all along

config/autoconf.mk.in

@@ -62,11 +62,7 @@ MOZ_INSURE_DIRS = @MOZ_INSURE_DIRS@
 MOZ_INSURE_EXCLUDE_DIRS = @MOZ_INSURE_EXCLUDE_DIRS@
 
 MOZ_BUILD_XPFE = @MOZ_BUILD_XPFE@
-
-ifndef MOZ_BUILD_XPFE
-MOZ_NO_WALLET_HACK=1
-endif
-
+MOZ_NO_WALLET_HACK = @MOZ_BUILD_XPFE@
 MOZ_NATIVE_NSPR = @MOZ_NATIVE_NSPR@
 
 # Should the extra CFLAGS only be added in Makefile.ins that need them?