automake: Move top-level makefile to automake.

This is part of a series to fix our build issues in the automake case
by hooking up the automatic Makefile regeneration support.  The
extract_git_sha1 is moved into src/mesa/Makefile so that we get
correct dependency generation.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

bin/extract_git_sha1

@@ -1,20 +0,0 @@
-#!/bin/sh
-if [ ! -f src/mesa/main/git_sha1.h ]; then
-	touch src/mesa/main/git_sha1.h
-fi
-
-if [ ! -d .git ]; then
-	exit
-fi
-
-if which git > /dev/null; then
-    # Extract the 7-digit "short" SHA1 for the current HEAD, convert
-    # it to a string, and wrap it in a #define.  This is used in
-    # src/mesa/main/version.c to put the GIT SHA1 in the GL_VERSION string.
-    git log -n 1 --oneline |\
-	sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
-	> src/mesa/main/git_sha1.h.tmp
-    if ! cmp -s src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h; then
-    	mv src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h
-    fi
-fi