context build changes for Unix

- removed an extraneous space from Makefile.src that confused GNU make
- unixmain.c still had a couple uses of flags.move

sys/unix/Makefile.src

@@ -355,7 +355,7 @@ CSOURCES = $(HACKCSRC) $(SYSSRC) $(WINCSRC) $(GENCSRC)
 #
 HACKINCL = align.h amiconf.h artifact.h artilist.h attrib.h beconf.h color.h \
 	config.h config1.h context.h coord.h decl.h def_os2.h display.h dlb.h \
-	dungeon.h edog.h emin.h engrave.h epri.h eshk.h extern.h flag.h \ 
+	dungeon.h edog.h emin.h engrave.h epri.h eshk.h extern.h flag.h \
 	func_tab.h global.h hack.h lev.h macconf.h mfndpos.h micro.h mkroom.h \
 	monattk.h mondata.h monflag.h monst.h monsym.h obj.h objclass.h \
 	os2conf.h patchlevel.h pcconf.h permonst.h prop.h rect.h region.h rm.h \