Fix GN dirty checking for SPIR-V test files.

Previously, GN would never reach steady-state when compiling test files
because SPIR-V listed the incorrect extension for its test files
(.spirv). We can now reach steady-state when building more than once.

Change-Id: If9f6bf7a4722c1ca87b682186f0b7ba451311955
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/341976
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed