modemmanager: fix compilation under uClibc-ng

Needs nls.mk as a result of the glib2 change.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/modemmanager/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=modemmanager
 PKG_VERSION:=1.12.8
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=ModemManager-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://www.freedesktop.org/software/ModemManager
@@ -26,6 +26,7 @@ PKG_BUILD_PARALLEL:=1
 PKG_BUILD_DEPENDS:=glib2/host libxslt/host
 
 include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/nls.mk
 
 define Package/modemmanager/config
   source "$(SOURCE)/Config.in"