configs/buildroot: purge locales

This reduces the size of a firmware by 5MB.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

configs/buildroot/wrs_release_br2_config

@@ -233,7 +233,8 @@ BR2_TOOLCHAIN_HAS_THREADS_DEBUG=y
 BR2_TOOLCHAIN_HAS_THREADS_NPTL=y
 BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS=y
 BR2_TOOLCHAIN_HAS_SSP=y
-# BR2_ENABLE_LOCALE_PURGE is not set
+BR2_ENABLE_LOCALE_PURGE=y
+BR2_ENABLE_LOCALE_WHITELIST="C"
 BR2_GENERATE_LOCALE=""
 # BR2_TOOLCHAIN_GLIBC_GCONV_LIBS_COPY is not set
 BR2_USE_MMU=y