The 'existsPath' condition is not required, and worse still breaks some future
fixes.

Bug: b/133440380
Bug: b/133481698
Change-Id: I9c5d20bf7782443b0e0e3eb0aacebae251687164
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32048
Presubmit-Ready: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>