Fix a silly error.

To use the pregenerated locales, untar in the extra/locale directory.
Do a 'make config' or 'make menuconfig' in the uClibc root dir, then
a 'make headers' followed by 'make -C extra/locale pregen'.  Then
continue with 'make' as usual.

extra/locale/Makefile

@@ -128,3 +128,4 @@ clean:
 	rm -f gen_mmap locale.mmap lmmtolso
 	rm -f locale_data.c locale_data.o  uClibc_locale_data.h
 
+.PHONY: pregen