cross-x86_64-linux-musl: install linux API headers before musl to DESTDIR.

... otherwise some musl provided headers (scsi/sg.h) might be removed
by this without any apparent reason.
cross-i686-linux-musl: install linux API headers before musl to DESTDIR.

... otherwise some musl provided headers (scsi/sg.h) might be removed
by this without any apparent reason.
cross-arm-linux-musl: install linux API headers before musl to DESTDIR.

... otherwise some musl provided headers (scsi/sg.h) might be removed
by this without any apparent reason.

And disable libssp as was done to other cross-*-musl toolchains.
Merge pull request #282 from Gottox/master

odroid-u2-kernel: version bump; adding CONFIG_DRM_EXYNOS_G2D as module
cross-*: restrict building only on native builds.
chroot-gcc: fix triplet for i686-musl.
chroot-bash: explicitly disable NLS.
xbps: repair cross builds.
xbps-src: bump version.
xbps-src: revbump++ (force autobuilds).
exiftool: udpate to 9.48.
youtube-dl: update to 2014.01.30.1.
New Package: wavemon.
youtube-dl: update to 2014.01.30.2.
exiftool: update to 9.49.
shorewall: update to 4.5.21.6.
youtube-dl: update to 2014.02.03
exiftool: change permission to 644.
New package: powerdown-git.
python-musicbrainzngs: update to 0.5.