Remove the TILEGTK_INSTALL_XERROR_HANDLER definition when building because it is not defined in new versions of X11.

Author: Geballin

CMakeLists.txt

@@ -118,7 +118,6 @@ IF ( CMAKE_BUILD_TYPE STREQUAL Debug )
   ADD_DEFINITIONS   ( -DTILEGTK_SYNCHRONIZE )
   ADD_DEFINITIONS   ( -DTILEGTK_VERBOSE_XERROR_HANDLER )
 ENDIF ( CMAKE_BUILD_TYPE STREQUAL Debug )
-ADD_DEFINITIONS     ( -DTILEGTK_INSTALL_XERROR_HANDLER )
 ADD_DEFINITIONS     ( -DUSE_TCL_STUBS )
 ADD_DEFINITIONS     ( -DUSE_TK_STUBS )
 ADD_DEFINITIONS     ( -DUSE_TTK_STUBS )