GL_MAX_VARYING_COMPONENTS does not equal maxVertexOutputComponents.
The minimum supported limit for GL_MAX_VARYING_COMPONENTS is 60,
whereas the minimum for maxVertexOutputComponents is 64.

On devices that have the minimum limits the existing code will
report a limit for GL_MAX_VARYING_COMPONENTS that is too large
(64 vs 60). Report instead as (GL_MAX_VARYING_VECTORS * 4).

Bug: angleproject:4233
Change-Id: I920a32cf21040ff5b64746fcf3489db740028d48
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1978638Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>