mesa: Update to 8.0.5
cairo: Update to 1.12.6
Merge remote-tracking branch 'origin/master' into x-updates.
Updated Mesa to 9.0.2

Also updated libdrm to 2.4.40 (not 2.4.41 because they have broken tars for that)

Removed the Mesa patch for sis video on mips64el-linux because sis is not
supported in Mesa anyway (since version 8)
mesa: the build expression is not recursive
mesa: add 'enableR600LlvmCompiler' flag to switch on r600-llvm-compiler support (defaults to off)
libpng minor update
libspectre: minor update, patches no longer needed
minor poppler-data update
libtiff: major update to 4.*

Also minor modification of ghostscript to work with it.
freetype: minor update
harfbuzz: minor update
gobject-introspection: minor update
fontconfig: minor update
cairo: update, use xcb by default (no longer experimental)
djvulibre: minor update, refactored dependencies
glib: minor update

also needed for the updated cairo
gtk2: minor update
gdk-pixbuf: minor update
librsvg: major update