speakup: Fix building as extmod

spk_priv_keyinfo.h should be opened from the speakup directory. When
building as extmod we should thus open it from the module directory
rather than the main Linux source.

Signed-off-by: Samuel Thibault <[e-mail]>
Link: https://lore.kernel.org/r/20221118012206.j6hq6b6nfx2jhqg6@begin
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/accessibility/speakup/Makefile

···
 makemapdata-objs := makemapdata.o
 
 quiet_cmd_mkmap = MKMAP   $@
-      cmd_mkmap = TOPDIR=$(srctree) $(obj)/makemapdata > $@
+      cmd_mkmap = TOPDIR=$(srctree) \
+		  SPKDIR=$(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD),$(srctree)/drivers/accessibility/speakup) \
+		  $(obj)/makemapdata > $@
 
 $(obj)/mapdata.h: $(obj)/makemapdata
 	$(call cmd,mkmap)

drivers/accessibility/speakup/makemapdata.c

···
 {
 	int value, i;
 	struct st_key *this;
-	const char *dir_name;
+	const char *dir_name, *spk_dir_name;
 	char *cp;
 
 	dir_name = getenv("TOPDIR");
 	if (!dir_name)
 		dir_name = ".";
+	spk_dir_name = getenv("SPKDIR");
+	if (!spk_dir_name)
+		spk_dir_name = "drivers/accessibility/speakup";
 	bzero(key_table, sizeof(key_table));
 	add_key("shift",	1, is_shift);
 	add_key("altgr",	2, is_shift);
···
 			add_key(def_name, value, is_input);
 	}
 
-	open_input(dir_name, "drivers/accessibility/speakup/spk_priv_keyinfo.h");
+	open_input(spk_dir_name, "spk_priv_keyinfo.h");
 	while (get_define()) {
 		if (strlen(def_val) > 5) {
 			//if (def_val[0] == '(')