GLES1 has functions like glFrustum / glTranslatef which are baked 4x4
matrix operations. The purpose of this CL is to add those operations as
library functions in ANGLE, to make it convenient later on.

This is inspired by GLM and tested against GLM-generated numbers.

BUG=angleproject:2306

Change-Id: I3b428a115a935ee4f0d00585ad38745a38cc128c
Reviewed-on: https://chromium-review.googlesource.com/909578
Commit-Queue: Lingfeng Yang <lfy@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>