mendeleydesktop: import from AUR
glfw3-git: update PKGBUILD to use new direct git source

Since pacman 4.1, makepkg has supported VCS urls directly in the source
array.
gitvoodoo-git: update PKGBUILD to use new VCS sources system

Since pacman 4.1, makepkg has supported VCS urls directly in the source
array.
ninja-git: update PKGBUILD to use new direct git source

Since pacman 4.1, makepkg has supported VCS urls directly in the source
array.