libevas-generic-loaders: fix rsvg dependencies

Fixes http://autobuild.buildroot.net/results/f9bab292708f885f5e9713901952406f650491c2

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/efl/libevas-generic-loaders/Config.in

@@ -15,7 +15,11 @@ config BR2_PACKAGE_LIBEVAS_GENERIC_LOADERS_SVG
 	select BR2_PACKAGE_LIBRSVG
 	select BR2_PACKAGE_CAIRO
 	depends on BR2_USE_WCHAR # librsvg -> glib2
+	depends on BR2_INSTALL_LIBSTDCPP # librsvg -> pango
 	help
 	  This option enables the Evas generic SVG loader
 
+comment "SVG loader requires a toolchain with WCHAR and C++ support"
+	depends on !BR2_USE_WCHAR && !BR2_INSTALL_LIBSTDCPP
+
 endif