Wayland: Fix glfwInit closing stdin on failure

If platform initialization failed before either timer fd member had been
set to -1 or a valid fd, termination would close stdin.

(cherry picked from commit 3bbb41eacc)

README.md

@@ -161,6 +161,7 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: `glfwSetWindowSize` would resize a full screen window
  - [Wayland] Bugfix: A window content scale event would be emitted every time
    the window resized
+ - [Wayland] Bugfix: If `glfwInit` failed it would close stdin
 
 
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