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>

SVN-Revision: 43445