[fuchsia] Placate hermeticity checker.

u_trace.py was not explicitly listed as an input to u_tracepoints.py.

Change-Id: I8b0b3c35eabe5905ec461e6adb33fc369f579bc5
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/1036252
Fuchsia-Auto-Submit: Josh Gargus <jjosh@google.com>
Reviewed-by: John Bauman <jbauman@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
diff --git a/src/gallium/auxiliary/BUILD.gn b/src/gallium/auxiliary/BUILD.gn
index f8980d1..e2c8b93 100644
--- a/src/gallium/auxiliary/BUILD.gn
+++ b/src/gallium/auxiliary/BUILD.gn
@@ -491,6 +491,8 @@
   script = "util/u_tracepoints.py"
   outputs = [ output_path ]
 
+  inputs = [ "$mesa_build_root/src/util/perf/u_trace.py" ]
+
   args = [
     "-p",
     rebase_path("$mesa_build_root/src/util/perf", root_build_dir),