Don't build GL on Metal, Vulkan, Dawn, Direct3D bots

Misc fixes to omit GL-dependent targets and fix assumptions that
SK_SUPPORT_GPU implies SK_GL.

Bug: skia:10051
Change-Id: Ida88ac3f1bf4d9e23f66d0700c2bce18b938ed6f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/277456
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
29 files changed