[OS/2] Make .def files depend on fakelibs' deps instead of fakelibs themselves.

Fakelibs don't exist and will make the .def rules to fail.

Taken from the patch of Walter Meinl (Bug 648134).
[OS/2] Fix paths in xulrunos2.rc due to directory move.
[OS/2] Fix nsPrintingPromptService build break after API change.
[OS/2] Fix build break of ProfileReset.
Guard more IPC-dependent code with #ifdef MOZ_IPC.