package/rng-tools: fix build with argp-standalone and NLS

Fix the following build failure with argp-standalone and NLS raised
since commit 5430c8fedd0392e79e0c011825b056fea129980a:

/home/buildroot/autobuild/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/i686-buildroot-linux-uclibc/9.3.0/../../../../i686-buildroot-linux-uclibc/bin/ld: /home/buildroot/autobuild/instance-0/output-1/host/i686-buildroot-linux-uclibc/sysroot/usr/lib/libargp.a(argp-parse.o): in function `argp_version_parser':
/home/buildroot/autobuild/instance-0/output-1/build/argp-standalone-1.4.1/argp-parse.c:181: undefined reference to `libintl_dgettext'

[...]

configure: error: libargp not found

Fixes:
 - http://autobuild.buildroot.org/results/f7ee27fb4c3253f351deee9867a3b98128f079af

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/rng-tools/rng-tools.mk

@@ -20,8 +20,8 @@ RNG_TOOLS_CONF_OPTS = --without-pkcs11
 # Work around for uClibc or musl toolchains which lack argp_*()
 # functions.
 ifeq ($(BR2_PACKAGE_ARGP_STANDALONE),y)
-RNG_TOOLS_CONF_ENV += LIBS="-largp"
-RNG_TOOLS_DEPENDENCIES += argp-standalone
+RNG_TOOLS_CONF_ENV += LIBS="-largp $(TARGET_NLS_LIBS)"
+RNG_TOOLS_DEPENDENCIES += argp-standalone $(TARGET_NLS_DEPENDENCIES)
 endif
 
 ifeq ($(BR2_PACKAGE_LIBRTLSDR),y)