add a macro to ease conditional testing based on active window port

Add WINDOWPORT macro

example:
if (WINDOWPORT("tty"))
	pline("Look at me, I'm on tty at the moment!");

src/bones.c

@@ -190,7 +190,7 @@ sanitize_name(namebuf)
 char *namebuf;
 {
     int c;
-    boolean strip_8th_bit = (!strcmp(windowprocs.name, "tty")
+    boolean strip_8th_bit = (WINDOWPORT("tty")
                              && !iflags.wc_eight_bit_input);
 
     /* it's tempting to skip this for single-user platforms, since

src/cmd.c

@@ -1049,7 +1049,7 @@ wiz_show_wmodes(VOID_ARGS)
     int x, y;
     char row[COLNO + 1];
     struct rm *lev;
-    boolean istty = !strcmp(windowprocs.name, "tty");
+    boolean istty = WINDOWPORT("tty");
 
     win = create_nhwindow(NHW_TEXT);
     if (istty)

src/files.c

@@ -1279,7 +1279,7 @@ boolean uncomp;
     int i = 0;
     int f;
 #ifdef TTY_GRAPHICS
-    boolean istty = !strncmpi(windowprocs.name, "tty", 3);
+    boolean istty = WINDOWPORT("tty");
 #endif
 
     Strcpy(cfn, filename);

src/restore.c

@@ -828,7 +828,7 @@ register int fd;
 #ifdef AMII_GRAPHICS
     {
         extern struct window_procs amii_procs;
-        if (windowprocs.win_init_nhwindows == amii_procs.win_init_nhwindows) {
+        if (WINDOWPORT("amii") {
             extern winid WIN_BASE;
             clear_nhwindow(WIN_BASE); /* hack until there's a hook for this */
         }
@@ -844,7 +844,7 @@ register int fd;
     curs(WIN_MAP, 1, 1);
     dotcnt = 0;
     dotrow = 2;
-    if (strncmpi("X11", windowprocs.name, 3))
+    if (!WINDOWPORT("X11"))
         putstr(WIN_MAP, 0, "Restoring:");
 #endif
     restoreprocs.mread_flags = 1; /* return despite error */
@@ -859,7 +859,7 @@ register int fd;
             dotrow++;
             dotcnt = 0;
         }
-        if (strncmpi("X11", windowprocs.name, 3)) {
+        if (!WINDOWPORT("X11")) {
             putstr(WIN_MAP, 0, ".");
         }
         mark_synch();

src/save.c

@@ -178,7 +178,7 @@ dosave0()
     dotcnt = 0;
     dotrow = 2;
     curs(WIN_MAP, 1, 1);
-    if (strncmpi("X11", windowprocs.name, 3))
+    if (!WINDOWPORT("X11"))
         putstr(WIN_MAP, 0, "Saving:");
 #endif
 #ifdef MFLOPPY
@@ -242,7 +242,7 @@ dosave0()
             dotrow++;
             dotcnt = 0;
         }
-        if (strncmpi("X11", windowprocs.name, 3)) {
+        if (!WINDOWPORT("X11")) {
             putstr(WIN_MAP, 0, ".");
         }
         mark_synch();