libglib2: fix build with/without locale support

Don't select BR2_ENABLE_LOCALE. Glib works without locale support in
toolchain, and packages shouldn't silently select toolchain options.

Only select libiconv if locale support isn't enabled.

package/libglib2/Config.in

@@ -1,9 +1,8 @@
 config BR2_PACKAGE_LIBGLIB2
 	bool "libglib2"
-	select BR2_ENABLE_LOCALE
 	select BR2_PACKAGE_GETTEXT
 	select BR2_PACKAGE_LIBINTL
-	select BR2_PACKAGE_LIBICONV
+	select BR2_PACKAGE_LIBICONV if !BR2_ENABLE_LOCALE
 	select BR2_PACKAGE_PKGCONFIG
 	help
 	  Low-level core library that forms the basis of GTK+ and GNOME.

package/libglib2/libglib2.mk

@@ -47,6 +47,10 @@ LIBGLIB2_CONF_ENV =	$(TARGET_CONFIGURE_OPTS) $(TARGET_CONFIGURE_ARGS) \
 LIBGLIB2_CONF_OPT = --enable-shared \
 		--enable-static $(DISABLE_NLS)
 
-LIBGLIB2_DEPENDENCIES = uclibc gettext libintl libiconv pkgconfig
+LIBGLIB2_DEPENDENCIES = uclibc gettext libintl pkgconfig
+
+ifneq ($(BR2_ENABLE_LOCALE),y)
+LIBGLIB2_DEPENDENCIES+=libiconv
+endif
 
 $(eval $(call AUTOTARGETS,package,libglib2))