Utils: More explicit host os use to make it stand out

Quite a few of the uses are actually wrong, but are better visible
now and therefore more likely to be fixed.

Change-Id: Ia51f7d6eb1b2d3a9c9f73d67dabacfd227c44b15
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/qmakeprojectmanager/makefileparse.cpp

@@ -479,8 +479,8 @@ void QmakeProjectManagerPlugin::testMakefileParser()
     MakeFileParse parser("/tmp/something", MakeFileParse::Mode::FilterKnownConfigValues);
     parser.parseCommandLine(command, project);
 
-    QCOMPARE(ProcessArgs::splitArgs(parser.unparsedArguments()),
-             ProcessArgs::splitArgs(unparsedArguments));
+    QCOMPARE(ProcessArgs::splitArgs(parser.unparsedArguments(), HostOsInfo::hostOs()),
+             ProcessArgs::splitArgs(unparsedArguments, HostOsInfo::hostOs()));
     QCOMPARE(parser.effectiveBuildConfig({}), effectiveBuildConfig);
 
     const QMakeStepConfig qmsc = parser.config();