segfault when quitting

[Nicola Pero]

Segmentation fault when quitting GSTest.app, likely caused by the
NSGraphicsContext dealloc patch (which doesn't necessarily imply the patch
is wrong, it might be a bug somewhere else which was discovered by the
patch).

(gdb) i stack
#0  0x40625d91 in free () from /lib/libc.so.6
#1  0x40625c13 in free () from /lib/libc.so.6
#2  0x408a6163 in _XFreeDisplayStructure () from /usr/X11R6/lib/libX11.so.6
#3  0x408962d7 in XCloseDisplay () from /usr/X11R6/lib/libX11.so.6
#4  0x4078c2e0 in _i_XGContext__dealloc () from 
/opt/gnustep/System/Library/Bundles/libgnustep-xgps.bundle/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-xgps
#5  0x403ea857 in _i_NSObject__release () from 
/opt/gnustep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-base.so.1
#6  0x4038f169 in _i_NSAutoreleasePool__dealloc () from 
/opt/gnustep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-base.so.1
#7  0x4038f0d3 in _i_NSAutoreleasePool__release () from 
/opt/gnustep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-base.so.1
#8  0x400c3bd2 in _i_NSApplication__terminate_ () from 
/opt/gnustep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-gui.so.0
#9  etc