please review fix for 205418

Please review fix for IZ 205418:
IZ link: http://netbeans.org/bugzilla/show_bug.cgi?id=205418
fix link: http://hg.netbeans.org/cnd-main/rev/9d81aad71afb and 
http://hg.netbeans.org/cnd-main/rev/6683913fe889

The problem: MinGW gdb does not understand msys path format 
(/C/Documents/...) although bash from msys does.
Issue appeared as a regression after IZ 201670 was fixed (Cygwin gdb 
understand /cygpath/...)
Previously we did not use msys path format for MinGW gdb, so the fix is 
not to use it.

Fix is reviewed and verified by QA.

Thanks,
Egor