libc/eglibc: fix localedef 2.14 build

The localedef of eglibc 2.14 requires NOT_IN_libc to be defined in order to
compile intl/l10nflist.c.

This is because localedef is built separately from eglibc and uses some parts of
eglibc that don't compile in standalone without this preprocessor definition.

This fixes the following error:

[ALL ] gcc -g -O2 -DNO_SYSCONF -DNO_UNCOMPRESS
-DLOCALE_PATH='"/usr/lib/locale:/usr/share/i18n"'
-DLOCALEDIR='"/usr/lib/locale"' -DLOCALE_ALIAS_PATH='"/usr/share/locale"'
-DCHARMAP_PATH='"/usr/share/i18n/charmaps"'
-DREPERTOIREMAP_PATH='"/usr/share/i18n/repertoiremaps"'
-DLOCSRCDIR='"/usr/share/i18n/locales"' -Iglibc/locale/programs -Iglibc/locale
-I/<snip>/.build/src/eglibc-localedef-2_14/include
-I/<snip>/.build/src/eglibc-localedef-2_14 -I.
-include /<snip>/.build/src/eglibc-localedef-2_14/include/always.h -Wall
-Wno-format -c -o locarchive.o glibc/locale/programs/locarchive.c
[ALL ] glibc/locale/programs/locarchive.c: In function 'enlarge_archive':
[ALL ] glibc/locale/programs/locarchive.c:303:21: warning: variable
'oldlocrectab' set but not used [-Wunused-but-set-variable]
[ALL ] In file included from glibc/locale/programs/locarchive.c:651:0:
[ALL ] glibc/locale/programs/../../intl/l10nflist.c: In function
'_nl_normalize_codeset':
[ERROR] glibc/locale/programs/../../intl/l10nflist.c:342:9: error:
'_nl_C_locobj_ptr' undeclared (first use in this function)
[ALL ] glibc/locale/programs/../../intl/l10nflist.c:342:9: note: each
undeclared identifier is reported only once for each function it appears in
[ALL ] glibc/locale/programs/locarchive.c: In function
'add_locales_to_archive':
[ALL ] glibc/locale/programs/locarchive.c:1450:7: warning: passing argument
1 of '__xpg_basename' discards 'const' qualifier from pointer target type
[enabled by default]
[ALL ] /usr/include/libgen.h:35:14: note: expected 'char *' but argument is
of type 'const char *'
[ERROR] make[1]: *** [locarchive.o] Error 1

Signed-off-by: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
(transplanted from 4cd9134739b594451794cf61a6e1b137422cdafd)

 # This will build and install sstrip to run on host and sstrip target files

 do_sstrip_get() { :; }

 do_sstrip_extract() { :; }

 do_sstrip() { :; }

 if [ "${CT_SSTRIP}" = "y" ]; then

     do_sstrip_get() {

         CT_GetFile sstrip .c http://git.buildroot.net/buildroot/plain/toolchain/sstrip

     }

     do_sstrip_extract() {

         # We leave the sstrip maintenance to the buildroot people:

         # -> any fix-up goes directly there

         # -> we don't have patches for it

         # -> we don't need to patch it

         # -> just create a directory in src/, and copy it there.

         CT_DoExecLog DEBUG mkdir -p "${CT_SRC_DIR}/sstrip"

         CT_DoExecLog DEBUG cp -v "${CT_TARBALLS_DIR}/sstrip.c" "${CT_SRC_DIR}/sstrip"

     }

     do_sstrip() {

         local sstrip_cflags

         CT_DoStep INFO "Installing sstrip"

         mkdir -p "${CT_BUILD_DIR}/build-sstrip"

         cd "${CT_BUILD_DIR}/build-sstrip"

         if [ "${CT_STATIC_TOOLCHAIN}" = "y" ]; then

             sstrip_cflags="-static"

         fi

         CT_DoLog EXTRA "Building sstrip"

         CT_DoExecLog ALL "${CT_HOST}-gcc" -Wall ${sstrip_cflags} -o sstrip "${CT_SRC_DIR}/sstrip/sstrip.c"

         CT_DoLog EXTRA "Installing sstrip"

         CT_DoExecLog ALL install -m 755 sstrip "${CT_PREFIX_DIR}/bin/${CT_TARGET}-sstrip"

         CT_EndStep

     }

 fi