Modify fetch_sources to remove the master-tot tag

This matches the upstream code. The master-tot tag is continually moved
to point to new commits, and that change causes fetch from origin to
return an error if the tag's not removed from the local checkout.

Change-Id: I08929ef947288dd16c3ac874abb86ec364637101
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/vulkan-cts/+/539623
Reviewed-by: Craig Stout <cstout@google.com>
diff --git a/external/fetch_sources.py b/external/fetch_sources.py
index 58c825f..a9bcaf6 100644
--- a/external/fetch_sources.py
+++ b/external/fetch_sources.py
@@ -322,7 +322,8 @@
 		"https://fuchsia.googlesource.com/third_party/glslang",
 		None,
 		"2849c2bd8cc40867dc1554fef671cf81b55663f5",
-		"glslang"),
+		"glslang",
+		removeTags = ["master-tot"]),
 	GitRepo(
 		"https://fuchsia.googlesource.com/third_party/spirv-headers",
 		None,