package/gtkperf: fix build with NLS

Fixes:
 - http://autobuild.buildroot.org/results/747469b359dd05cfa05b4295958f8a8175166cfe

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

package/gtkperf/gtkperf.mk

@@ -7,8 +7,9 @@
 GTKPERF_VERSION = 0.40
 GTKPERF_SOURCE = gtkperf_$(GTKPERF_VERSION).tar.gz
 GTKPERF_SITE = http://downloads.sourceforge.net/project/gtkperf/gtkperf/$(GTKPERF_VERSION)
-GTKPERF_DEPENDENCIES = libgtk2
+GTKPERF_DEPENDENCIES = libgtk2 $(TARGET_NLS_DEPENDENCIES)
 GTKPERF_LICENSE = GPL-2.0
 GTKPERF_LICENSE_FILES = COPYING
+GTKPERF_CONF_ENV = LIBS=$(TARGET_NLS_LIBS)
 
 $(eval $(autotools-package))