* harbour/make_gcc.sh
* harbour/make_gnu.bat
* harbour/make_gnu.sh
* harbour/config/lib.cf
* harbour/config/bin.cf
+ added MK_USR to pass GNU MAKE flags
* harbour/source/vm/set.c
* minor cleanup and simplifications in hb_setSetItem().
* grouped SETs with the same item type in hb_setSetItem() function
together.