Roll buildtools/ 6302c1175..c38b5ab1c (5 commits)

https://chromium.googlesource.com/chromium/src/buildtools.git/+log/6302c1175607..c38b5ab1c6f5

Created with:
  roll-dep buildtools

Change-Id: I06204399964729e75f9ab93d3a185c6d79695650
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/77372
Reviewed-by: Hui Yingst <nigi@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
diff --git a/DEPS b/DEPS
index 0cca1f5..e18e583 100644
--- a/DEPS
+++ b/DEPS
@@ -33,7 +33,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling buildtools
   # and whatever else without interference from each other.
-  'buildtools_revision': '6302c1175607a436e18947a5abe9df2209e845fc',
+  'buildtools_revision': 'c38b5ab1c6f5a4913afe49709f7acde15229f400',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling catapult
   # and whatever else without interference from each other.