package/speechd: fix NLS build

Fix the following NLS build failure raised since the addition of the
package in commit 9f4f8c5f8993c6d7c2ef730ac211ef84ac9ae26d:

/home/buildroot/autobuild/run/instance-2/output-1/host/lib/gcc/arm-buildroot-linux-musleabihf/12.3.0/../../../../arm-buildroot-linux-musleabihf/bin/ld: ../../src/common/.libs/libcommon.a(libcommon_la-i18n.o): undefined reference to symbol 'libintl_bindtextdomain'

Fixes:
 - http://autobuild.buildroot.org/results/8ab13cf474d732c95a1da65592d950b24b3d474b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit f6a7050d7191b9a534d1d2789ceb72d69f25da83)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/speechd/speechd.mk

@@ -12,8 +12,11 @@ SPEECHD_INSTALL_STAGING = YES
 # speechd source code is released without configure script
 SPEECHD_AUTORECONF = YES
 SPEECHD_GETTEXTIZE = YES
-SPEECHD_DEPENDENCIES = host-pkgconf dotconf libglib2 libsndfile
-SPEECHD_CONF_ENV = ac_cv_prog_HELP2MAN=""
+SPEECHD_DEPENDENCIES = \
+	host-pkgconf dotconf libglib2 libsndfile $(TARGET_NLS_DEPENDENCIES)
+SPEECHD_CONF_ENV = \
+	ac_cv_prog_HELP2MAN="" \
+	LIBS=$(TARGET_NLS_LIBS)
 SPEECHD_CONF_OPTS = \
 	--disable-python \
 	--without-espeak \