fix Android build

I removed the method in commit
a62129aa
"loplugin:unusedmethods xmloff"

Change-Id: I0e543b4b9b572f843f68023396d9344c455c2bc1

xmloff/source/draw/ximpshap.hxx

@@ -530,6 +530,10 @@ public:
 
     // this is called from the parent group for each unparsed attribute in the attribute list
     virtual void processAttribute( sal_uInt16 nPrefix, const OUString& rLocalName, const OUString& rValue ) SAL_OVERRIDE;
+
+#if !HAVE_FEATURE_GLTF
+    const OUString& getMimeType() const { return maMimeType; }
+#endif
 };
 
 // draw:floating-frame