cairo: Make patch useful in static and shared builds.
libsigc++: Update.
cairomm: Update & enable shared.
gdb: Use "system" readline, enable shared.
json-c: Update, enable shared & refresh patch.

This fixes CVE-2013-6371 and CVE-2013-6370.
glfw2: Enable shared build
glfw3: Update, enable shared & refresh patch.
gta: Enable shared build.
Merge pull request #525 from TobiX/some-fixes

Some fixes