Include upstream equivalent patch to fix build with older kernel headers. This fixes build failures caused by the previous (reverted) version bump: http://autobuild.buildroot.net/results/563/563f46e9a11f9e3b174a4e1308444f284d1b3421/ http://autobuild.buildroot.net/results/970/970463b628d9c81d5e217e92a455d2e05d0aa89e/ http://autobuild.buildroot.net/results/cee/ceea635a9d620398cbcd44ccb859b07bf6682780/ Add libc-compat.h patch to make it work for musl libc. Add another upstream patch to fix both missing strerror_l() implementation, and optionally missing locale support in uClibc-ng: http://autobuild.buildroot.net/results/dce/dce5d21c27df57ac96d9302752dd1802e7a9786b/ http://autobuild.buildroot.net/results/c4b/c4b1c3f396ddd1d9242aed0953558606f929d57d/ http://autobuild.buildroot.net/results/44d/44dd3db6cdda4646fa12ccf243d6aca16bed3c90/ Add host-pkgconf dependency, since configure.ac uses PKG_CHECK_MODULES. Add optional dependency on the 'check' package. Cc: Gustavo Zacarias <gustavo@zacarias.com.ar> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>