Remove patch-src_gui_qgisgui_h which was part of
3e738405e2
upstream.
Switch to use gcc4 on all platforms (not only on i386), the new DWG
importer (added in a stable branch.. sigh) doesn't build with base gcc,
and what's the point of trying to build a modern c++ codebase with a 10
year-old compiler ?
Bump all shlib majors for lots of symbols removed as a consequence.
376cfc4d70