Commit 
e68a558fb2af ("speakup: Fix building as extmod") was intended
to support building this as an external module.
Since commit 
b1992c3772e6 ("kbuild: use $(src) instead of
$(srctree)/$(src) for source directory"), $(src) consistently points
to the source directory, regardless of whether it is compiled as an
external module or not.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
 
 makemapdata-objs := makemapdata.o
 
 quiet_cmd_mkmap = MKMAP   $@
-      cmd_mkmap = TOPDIR=$(srctree) \
-                 SPKDIR=$(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD),$(srctree)/drivers/accessibility/speakup) \
-                 $(obj)/makemapdata > $@
+      cmd_mkmap = TOPDIR=$(srctree) SPKDIR=$(src) $(obj)/makemapdata > $@
 
 $(obj)/mapdata.h: $(obj)/makemapdata
        $(call cmd,mkmap)