defcon: import from aur (defcon-humblebundle)
defcon: pretty much rewrite the pkgbuild to make it much simpler
glfw2: patch glfw-2.7.9 to fix conflicts with GLFW 3

It's not a nice way to do it, but GLFW 2 and GLFW 3 library names don't
quite play nice with each other because although GLFW 3 uses proper
soname versioning, GLFW 2 does not. This patch gives libglfw.so a proper
soname of libglfw.so.2, renames libglfw.a to libglfw2.a, and libglfw.pc
to libglfw2.pc.