Windows resource files support a subset of C preprocessor directives.
Among others they can have #include directives.
Use QMake's own scanner to retrieve the files that are included by a
Windows resource file and add them to its dependencies.
For the test case the TestCompiler class had to be extended:
runCommand is now public, and commandOutput is less peculiar.
Fixes: QTBUG-3859
Change-Id: I138703352c37c98297c0574a9a440510c1c494b8
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Joerg Bornemann