Fixes the suprious newlines messages. Also prefer a Release directory
when writing shaders for performance. Also adds glslang's git HEAD to
the list of generated hashes. This should ensure we regenerate all
shaders when there's a roll of glslang.

Glslang was rolled prior to this CL. Also update the SPRI-V libs.

Bug: angleproject:3227
Change-Id: I1fd212a08000c08ef41b60c4201edd3ac771f91d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1516512Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>