package/libvips: fix build with NLS

Fixes:
 - http://autobuild.buildroot.org/results/cd61be84dc9781ea645f7667c2bd29908484692f

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b96acd52aface4a7367ccdded65c4d933b6059eb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libvips/libvips.mk

@@ -20,7 +20,8 @@ ifeq ($(BR2_sparc64),y)
 LIBVIPS_CXXFLAGS += -O0
 endif
 
-LIBVIPS_CONF_ENV += CXXFLAGS="$(TARGET_CXXFLAGS) $(LIBVIPS_CXXFLAGS)"
+LIBVIPS_CONF_ENV += CXXFLAGS="$(TARGET_CXXFLAGS) $(LIBVIPS_CXXFLAGS)" \
+	LIBS=$(TARGET_NLS_LIBS)
 
 LIBVIPS_CONF_OPTS = \
 	--disable-introspection \