Build error: `You got a tab character in here. Tabs are evil. Convert to spaces.`

Bug: b/139528538
Change-Id: Ic06cc9e0aafa0a4d3517fc13428724d6fe40e0b5
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38589Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Ben Clayton <bclayton@google.com>