libconfig: import recipe from meta-oe

libconfig: import recipe from meta-oe

One of the freedreno tools in the Mesa package depends on libconfig.
Recipes from other layers also depend on libconfig. It makes sense to
move libconfig to OE-Core in order to reduce inter-layer dependencies.

Changes between meta-oe and this recipe:
- Upgraded to 1.8.1
- Switched to UPSTREAM_CHECK_GITTAGREGEX
- Switched from autotools-brokensep to autotools
- Added a patch fixing reproducibility issues

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>