webkit: Version bump to 1.11.5

Also apply the following patches:
- upstream fix for 32-bit autotools
- upstream fix for conditional gstreamer build of gtklauncher
- upstream fix for detecting the latest harfbuzz
- Update existing patch for disabling docs
- Update existing patch for execinfo_h
- upstream patch for the MIPS DFG support. This fixes
compilation problems on MIPS.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>