Android: Properly specify the supported toolchain languages

As one can easily see in the toolchain settings page, there are Android
C compilers, so don't claim the factory supports only C++ toolchains.

Change-Id: Ib84b7a70ef3359a7143e3f320fdb2cc913bfb24b
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/android/androidtoolchain.cpp

@@ -241,7 +241,9 @@ public:
     {
         setDisplayName(Tr::tr("Android Clang"));
         setSupportedToolchainType(Constants::ANDROID_TOOLCHAIN_TYPEID);
-        setSupportedLanguages({ProjectExplorer::Constants::CXX_LANGUAGE_ID});
+        setSupportedLanguages(
+            {ProjectExplorer::Constants::C_LANGUAGE_ID,
+             ProjectExplorer::Constants::CXX_LANGUAGE_ID});
         setToolchainConstructor([] { return new AndroidToolchain; });
     }
 };