oxr: check input type in oxr_swapchain_gl_enumerate_images

Don't blindly cast the input struct to XrSwapchainImageOpenGLKHR, check
that the type is XR_TYPE_SWAPCHAIN_IMAGE_OPENGL_KHR.
7 jobs for enumerate-images-check-type in 4 minutes and 59 seconds (queued for 11 seconds)
latest
Status Job ID Name Coverage
  Container Prep
passed #887794
arch:container_prep

00:01:44

passed #887793
debian:container_prep

00:01:20

 
  Build
passed #887797
arch:build-cmake

00:01:10

passed #887799
arch:build-meson

00:01:09

passed #887796
debian:build-cmake

00:00:46

passed #887798
debian:build-meson

00:02:01

passed #887795
format-and-spellcheck

00:00:15