flag adjustments (trunk only)

Move all system or port specific flags to sysflags which is used only if
SYSFLAGS is defined, and leave everything else in flags unconditional.

src/decl.c

@@ -137,6 +137,9 @@ struct trap *ftrap = (struct trap *)0;
 NEARDATA struct monst youmonst = DUMMY;
 NEARDATA struct context_info context = DUMMY;
 NEARDATA struct flag flags = DUMMY;
+#ifdef SYSFLAGS
+NEARDATA struct sysflag sysflags = DUMMY;
+#endif
 NEARDATA struct instance_flags iflags = DUMMY;
 NEARDATA struct you u = DUMMY;