Merge pull request #273 from jan-schreib/master

rxvt-unicode: added patches to set space between letters
libwebp: update to 0.4.0 (SONAME bump).
Revbump packages due to libwebp-0.4.0 update.
common/shlibs: add missing libGLESv2.so.2 soname.
SDL_image: fix cross build.
ImageMagick: update to 6.8.8-4.
ImageMagick: make this build again and add new SONAMEs.
inkscape: rebuild due to ImageMagick-6.8.8 update.
ImageMagick: rebuild with fixed common/shlibs.
inkscape: add patches for gc-7.4 compat; sync patches with Arch.
sg3_utils: update to 1.37.
chromium: enable system webp now that we have 0.4.0.
chromium: remove unused/dup build-deps.
xbps-src: bump version.
nspr: update to 4.10.3.
xbps-src: revbump++ (only_for_archs now supports musl fake archs).
New package: base-chroot-musl.
New package: obexftp-0.24.
New package: smbnetfs-0.5.3b.
New package: libstrophe-git.