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Reviewed by Simon Hausmann.

setPathForRunningWebKitApp() is implemented for the Qt port
by using qmake to query for the location of the Qt libraries.

This requires the original environment (%ENV) to be untouched,
so launchWithCurrentEnv() was refactored to launchWithEnv(),
and the code in openDumpTool() to not use %ENV but a %CLEAN_ENV
instead. This has the added benefit of getting rid of the temp
variables used for storing the current env.

openDumpTool() is also refactored a bit into platform-spesific,
port-spesific, and generic environment variables.

Checks for undef was added a few places to fix Perl concat
warnings when run-webkit-tests is aborted.

https://bugs.webkit.org/show_bug.cgi?id=33895

* Scripts/run-webkit-tests:
* Scripts/webkitdirs.pm:

git-svn-id: svn://svn.chromium.org/blink/trunk@54339 bbb929c8-8fbe-4397-9dbb-9b2b20218538