CppTools: Predefine __func__ and friends

...so the built-in parser can handle them.

Change-Id: Iff69638f8939c3c4dced99699a3357dd94b23c71
Task-number: QTCREATORBUG-15431
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/cpptools/cppmodelmanager.cpp

@@ -190,6 +190,12 @@ const char pp_configuration[] =
 
     "#define _Pragma(x)\n" // C99 _Pragma operator
 
+    "#define __func__ \"\"\n"
+
+    // ### add macros for gcc
+    "#define __PRETTY_FUNCTION__ \"\"\n"
+    "#define __FUNCTION__ \"\"\n"
+
     // ### add macros for win32
     "#define __cdecl\n"
     "#define __stdcall\n"