FLTK disabled by default (build with gmake USE_FLTK=1 to enable) installer

can toggle this.

src/sbbs3/scfg/GNUmakefile

@@ -21,7 +21,7 @@ ifndef DEBUG
 endif
 
 #USE_DIALOG =	1	# Dialog vesrion of UIFC
-USE_FLTK =	1	# Use Windowed version
+#USE_FLTK =	1	# Use Windowed version
 USE_CURSES	=	1	# Curses version of UIFC
 CC		=	gcc
 CCPP		=	gcc