* harbour/source/rtl/gtgui/Makefile
* harbour/source/rtl/gtgui/gtgui.c
* hacked GTGUI for W32 to be compiled using the same name as RTL default
GT driver (GTWIN).
* harbour/include/hbgtcore.h
* harbour/source/rtl/hbgtcore.c
* changed 'char *' to 'const char *' in hb_gtSetDefault(), hb_gtLoad()