minor fixes:

minor fixes:
1. removed "We already do it" as "We" is not a valid shell command :-)
2. define _GNU_SOURCE in setup.h and not in the compiler flags
3. allow to build with GTK2 without pangoft2 (and without printing then)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16484 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775