Top level .gitignore: Group anchored and unanchored patterns

The anchored patterns match only in the top directory; the unanchored
patterns match in any subdirectory. While I'm moving the unanchored
patterns around anyway, sort them in lexicographical (LC_ALL=C sort)
order.

Signed-off-by: Simon McVittie <smcv@collabora.com>

.gitignore

@@ -1,15 +1,9 @@
-.*.sw?
-*.orig
-*.rej
-*.o
-*~
 /.ccache/
 /build-aux/
 /config.cache
 /config.log
 /config.status
 /configure
-cscope.out
 /*.pc
 /libtool
 /m4/lt*.m4
@@ -18,19 +12,10 @@ cscope.out
 /stamp-h
 /stamp-h.in
 /Doxyfile
-Makefile
-Makefile.in
 /aclocal.m4
 /autom4te.cache
 /config.h
 /config.h.in
-*.bb
-*.bbg
-*.da
-*.gcov
-*.gcda
-*.gcno
-tags
 /bus/tmpfiles.d/dbus.conf
 /dbus-1.*/
 /dbus-1.*.tar.*
@@ -38,3 +23,19 @@ tags
 /lcov.info
 /lcov.info.tmp
 /test-driver
+
+*.bb
+*.bbg
+*.da
+*.gcda
+*.gcno
+*.gcov
+*.o
+*.orig
+*.rej
+*~
+.*.sw?
+Makefile
+Makefile.in
+cscope.out
+tags