package/granite: link with -lintl if needed

package/granite: link with -lintl if needed

Link with TARGET_NLS_LIBS if needed to avoid the following build
failure:

/home/buildroot/autobuild/run/instance-2/output-1/host/opt/ext-toolchain/bin/../lib/gcc/xtensa-buildroot-linux-uclibc/9.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: lib/libgranite.so.5.4.0.p/meson-generated_Application.c.o: in function `_vala_array_free.constprop.0':
Application.c:(.text+0x340): undefined reference to `libintl_bindtextdomain'

Fixes:
 - http://autobuild.buildroot.org/results/d754cb776a1e11031cef4e66d45619aad5c4575d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>