CMake: Replace parseCMakeCacheDotTxt() function

... by direct use of  CMakeConfig::fromFile(). It was only duplicating
checks that are done on the user side already.

Change-Id: Iaf5e89c924c2b0a9080db9fe160970bbf6e33154
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakeprojectimporter.cpp

@@ -304,7 +304,7 @@ QList<void *> CMakeProjectImporter::examineDirectory(const FilePath &importPath,
     }
 
     QString errorMessage;
-    const CMakeConfig config = CMakeBuildSystem::parseCMakeCacheDotTxt(cacheFile, &errorMessage);
+    const CMakeConfig config = CMakeConfig::fromFile(cacheFile, &errorMessage);
     if (config.isEmpty() || !errorMessage.isEmpty()) {
         qCDebug(cmInputLog) << "Failed to read configuration from" << cacheFile << errorMessage;
         return { };