Problems with QVariant and some undefined functions on Linux...

[Jarhmander]

Fixes for libfamitracker and nesicide

2 small changes here:

• QVariant has ctor overloads for int, unsigned int, qlonglong (long long int) and qulonglong (unsigned long long int), but no unsigned long int overload. As a result, (implicit) calls to QVariant ctor with UINT_PTR arguments are ambiguous. Fix: those problematic implicit ctor calls cast the UINT_PTR value to uint_ptr, a typedef hidden in a namespace qtmfc_workaround; uint_ptr is unsigned int or qulonglong depending on the size of UINT_PTR;
• Commented-out calls to ShellExecute and TrackMouseEvent: they are currently undefined.

Sorry for the noise.

[Jarhmander]

Commit 9af8be9 and commit d9fc5b6 have the proposed fixes and implements the ShellExecute and TrackMouseEvent functions.