Log Message:
update to wxGTK 2.4.2

Changes:
Enable building of OpenGL support and bump buildlink dependecy because of
that.

2.4.2
-----
All:
- always NUL-terminate the log messages
- wxRegEx::Compile() now calculates the number of groups correctly
- wxHTTP::GetHeader() didn't find headers which were not all in upper case
- wxHTTP input stream didn't detect EOF correctly
- wxString::find_last_of() ignored "start" parameter (Robert Vazan)
- a bug in wxArrayString::Shrink() fixed (Gunnar Roth)
- added wxIPV4address::IPAddress()

All (GUI):
- rare crash in wxFontMapper fixed (Robert Vazan)
- added wxMenu::FindItemByPosition.
- copy wxImage options when copying the images

Generic:
- wxListCtrl: respect wxLC_NO_HEADER style when inserting first column

Unix:
- fixed build problems with OpenGL when libGL(U) were in different directories
- added --basename and --release flags to wx-config (Robert O'Connor)
- added support for GNU/Hurd in configure
- fixed wx-config --rezflags output on platforms different from Mac
- changed wxNativeFontInfo::FromXFontName to treat names with all
  components being empty or '*' as default font (since default font is
  converted to such a string by GetXFontName).
- wxLocale::Init now tries to set .utf8 locale in Unicode mode (Andreas Pflug)

wxGTK
- fixed compilation with --disable-compat-22
- set the event object correctly for wxMenu events (Bob Balfour)
- fixed memory leak in wxFileDialog (Christian Sturmlechner)

wxXRC:
- added wxNO_FULL_REPAINT_ON_RESIZE to "unknown" class handler (John \ 
Anderson)