This should disable code generation of exception handling, which we do not require.

Bug: b/135298866
Change-Id: I081d4317d7cdad6a9101db026bb72e4a09fb874c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32949
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>