libsepol: fix static build

Commit a3ebe45d (libsepol: bump to version 2.5, 2016-06-26) didn't refresh
correctly the patch adding static build support. Do this now.

Fixes:
http://autobuild.buildroot.net/results/14b/14bbb7c9c59e7f68f3ae7ad63e075e27a0da2b1e/
http://autobuild.buildroot.net/results/97f/97f61d5e46a7f479e8de5dd19d49f7a3d84cc86e/
http://autobuild.buildroot.net/results/920/920e1ddac6bf93707a187e64a4ef7d95aff09e6c/



Cc: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>