toolchain: uClibc: fix build with CONFIG_BUILD_NLS selected

toolchain: uClibc: fix build with CONFIG_BUILD_NLS selected

Without this patch, selecting "Compile with full language support"
results in the following question during build:

...
Locale Support (UCLIBC_HAS_LOCALE) [Y/n/?] y
  Locale data
  > 1. All locales (UCLIBC_BUILD_ALL_LOCALE) (NEW)
    2. Only selected locales (UCLIBC_BUILD_MINIMAL_LOCALE) (NEW)
    3. Use Pre-generated Locale Data (UCLIBC_PREGENERATED_LOCALE_DATA) (NEW)
  choice[1-3]:

Signed-off-by: Michael Heimpold <mhei@heimpold.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43445 3c298f89-4303-0410-b956-a3cf2f4a3e73