Roll buildtools 6f4dae280c..5941c1b3df

  In order to roll GN 84176d72..a3bcd204 (r564007:r567268) and pick up
  the following changes:

  3105b4b4 gn: Swap the order of two declarations.
  44054a1e Fix quoting when writing defines on Windows.

TBR=brettw@chromium.org

Change-Id: I95798c4c5e45c8faaf249b162d7d5c8ef47e7be1
Reviewed-on: https://chromium-review.googlesource.com/1101164Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567337}

DEPS

@@ -121,7 +121,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.
-  'buildtools_revision': '6f4dae280c6a542acacd8db281decc5c0b2a9823',
+  'buildtools_revision': '5941c1b3df96c1db756a2834343533335c394c4a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.