A different solution for Patch #100979: support for out-of-tree "make TAGS"

The version there built the tags and TAGS files in the build
directory.  I like them in the source directory.  The simplest
solution is to cd to the source directory before running ctags or
etags.

Tested both superficially and they work for me, on Linux Red Hat 6.1.

Makefile.in

@@ -460,13 +460,16 @@ autoconf:
 
 # Create a tags file for vi
 tags::
-		ctags -w -t Include/*.h
-		for i in $(SUBDIRS); do ctags -w -t -a $$i/*.[ch]; done
+		cd $(srcdir); \
+		ctags -w -t Include/*.h; \
+		for i in $(SUBDIRS); do ctags -w -t -a $$i/*.[ch]; \
+		done; \
 		sort tags -o tags
 
 # Create a tags file for GNU Emacs
 TAGS::
-		etags Include/*.h
+		cd $(srcdir); \
+		etags Include/*.h; \
 		for i in $(SUBDIRS); do etags -a $$i/*.[ch]; done
 
 # Add dependencies to sub-Makefiles