-W[error=]unused-lambda-capture is not recognized by GCC.

Change-Id: I6d1bfc470c4afc0e72b76d2a26efb85eb8d8c8fb
Reviewed-on: https://swiftshader-review.googlesource.com/c/22368Reviewed-by: Takuto Ikuta <tikuta@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Takuto Ikuta <tikuta@google.com>