Break the link to the swiftshader source after the build

Change-Id: Id047cf6f7efcb9d5497fba9ee2f765f35cdce512
Reviewed-on: https://swiftshader-review.googlesource.com/3174
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Greg Hartman <ghartman@google.com>
1 file changed