Attempt to build glfw when pkg-config fails

Currently, the required glfw version is 3.4. However, a lot of distros (including Ubuntu 24.04, which is  the maximum CUDA supported Ubuntu) still ship with 3.3.

It would be nice for glfw-rs/glfw-sys to attempt using pkg-config to find the library and afterwards build if the correct version isn't available on the system (or any other failure).