...to reduce file size of debug builds on Linux.

Bug: b/142862126
Change-Id: Idab23a044502cfebb57e6b912a6c1f95692c50c8
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37388
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Paul Thomson <paulthomson@google.com>