dnsmasq: fix build without NLS

dnsmasq i18n support requires NLS for the provided gettext utilities.
Locale support, OTOH, is not required.

Fixes:
http://autobuild.buildroot.net/results/d45/d453aff1ce1f5e1d380bd7692a4a0565505027a3/
http://autobuild.buildroot.net/results/fb7/fb7844a239472eb48c18778aa7d515552ccfb4b9/
http://autobuild.buildroot.net/results/d85/d856ec3e6b28bd723176bb892a56dff5262a6b92/

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dnsmasq/dnsmasq.mk

@@ -35,7 +35,7 @@ ifeq ($(BR2_PACKAGE_DNSMASQ_IDN),y)
 DNSMASQ_DEPENDENCIES += libidn $(TARGET_NLS_DEPENDENCIES)
 DNSMASQ_MAKE_OPTS += LIBS+=$(TARGET_NLS_LIBS)
 DNSMASQ_COPTS += -DHAVE_IDN
-DNSMASQ_I18N = $(if $(BR2_ENABLE_LOCALE),-i18n)
+DNSMASQ_I18N = $(if $(BR2_SYSTEM_ENABLE_NLS),-i18n)
 endif
 
 ifeq ($(BR2_PACKAGE_DNSMASQ_CONNTRACK),y)