`make tags` fixes (GH-717)

* Fix `make tags` warnings

`make tags` target tries to find C sources and headers in "Grammar" and
"Mac" folders and generates these warnings:

    ctags: Warning: cannot open source file "Grammar/*.[ch]" : No such file or directory
    ctags: Warning: cannot open source file "Mac/*.[ch]" : No such file or directory

This commit changes $SRCDIRS variable in configure.ac to remote these
directories. This variable is used only for tags generation.

Also, "configure" was regenerated with `autoreconf`.

* Fix `make tags` fail on non-default tag names

When ctags overrides default tags filename (e.g. `-f .tags`) `make tags`
is failed because it assumes to see default `tags` filename:

    sort: cannot read: tags: No such file or directory

This commit explicitly specifies "tags" filename for tags generation.

3 files changed, 3 insertions, 3 deletions

diff --git a/Makefile.pre.in b/Makefile.pre.in
index 3da6637..4145634 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1555,7 +1555,7 @@ autoconf:
 tags::
 	cd $(srcdir); \
 	ctags -w Include/*.h; \
-	for i in $(SRCDIRS); do ctags -w -a $$i/*.[ch]; \
+	for i in $(SRCDIRS); do ctags -f tags -w -a $$i/*.[ch]; \
 	done; \
 	LC_ALL=C sort -o tags tags
 
diff --git a/configure b/configure
index f596fd8..26b4a05 100755
--- a/configure
+++ b/configure
@@ -16320,7 +16320,7 @@ do
 done
 
 
-SRCDIRS="Parser Grammar Objects Python Modules Mac Programs"
+SRCDIRS="Parser Objects Python Modules Programs"
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for build directories" >&5
 $as_echo_n "checking for build directories... " >&6; }
 for dir in $SRCDIRS; do
diff --git a/configure.ac b/configure.ac
index aca8255..8ab1c03 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5200,7 +5200,7 @@ do
 done
 
 AC_SUBST(SRCDIRS)
-SRCDIRS="Parser Grammar Objects Python Modules Mac Programs"
+SRCDIRS="Parser Objects Python Modules Programs"
 AC_MSG_CHECKING(for build directories)
 for dir in $SRCDIRS; do
     if test ! -d $dir; then