add local uClibc-locale-030818.tgz file

Fetched from https://www.uclibc.org/downloads/uClibc-locale-030818.tgz

There are situations where www.uclibc.org is not available.
See issue #49

Locale data can still be downloaded by setting
UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA to 'y'

extra/Configs/Config.in

@@ -807,11 +807,12 @@ config UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA
 	default n
 	help
 	  If you would like the build process to use 'wget'/'curl' to automatically
-	  download the pregenerated locale data, enable this option.  Otherwise
-	  you will need to obtain the locale data yourself from:
-		http://www.uclibc.org/downloads/uClibc-locale-030818.tgz
-	  and place the uClibc-locale-030818.tgz tarball in the extra/locale/
-	  directory.
+	  download the pregenerated locale data from http://www.uclibc.org/downloads/, 
+    enable this option. Otherwise a local tarball will be copied 
+    (from extra/locale/artefact/). 
+    If you wan't to use a custom version of locale data, you can place
+    your own tarball in extra/locale/. It will take precedence
+    over the one in artefact/ directory.
 
 	  Go ahead and make life easy for yourself... Answer Y.
 

extra/locale/Makefile.in

@@ -157,6 +157,8 @@ $(locale_OUT)/locale_collate.h: $(locale_OUT)/gen_collate $(locale_OUT)/locale_t
 $(locale_OUT)/$(LOCALE_DATA_FILENAME):
 ifeq ($(UCLIBC_DOWNLOAD_PREGENERATED_LOCALE_DATA),y)
 	( cd $(dir $@); $(GET) https://www.uclibc.org/downloads/$(notdir $@) )
+else
+	cp --no-clobber $(locale_DIR)/artefact/$(LOCALE_DATA_FILENAME) $(locale_OUT)
 endif
 
 ifeq ($(UCLIBC_PREGENERATED_LOCALE_DATA),y)