Makefile: Avoid trailing slash in find, it breaks tags on MacOS.

Makefile.in

diff --git a/Makefile.in b/Makefile.in
index 7a6d63b..5f3d768 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -131,10 +131,10 @@
 # Misc rules
 
 TAGS etags:
-	find $(TOPSRCDIR)/ -name '*.[ch]' -print | etags -
+	find -L $(TOPSRCDIR) -name '*.[ch]' -print | etags -
 
 tags ctags:
-	find $(TOPSRCDIR)/ -name '*.[ch]' -print | ctags --c-types=+px -L -
+	find -L $(TOPSRCDIR) -name '*.[ch]' -print | ctags --c-types=+px -L -
 
 manpages htmlpages sgmlpages: dummy
 	@cd documentation && $(MAKE) $@