CMake: Remember file location of CMake target definitions

Make fileapi remember where CMake targets were defined in the
CMakeBuildTarget struct. The other readers will just guess at
the location based on the source directory of the target.

Change-Id: Ia8fa226c548800992ccea64b1d5981d2f3013408
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildtarget.h

@@ -53,6 +53,9 @@ public:
     Utils::FilePath sourceDirectory;
     Utils::FilePath makeCommand;
 
+    Utils::FilePath definitionFile;
+    int definitionLine = -1;
+
     // code model
     QList<Utils::FilePath> includeFiles;
     QStringList compilerOptions;