Roll back CMake update on Windows bots.

CMake screwed up. See
https://github.com/Kitware/CMake/commit/f969f1a9ce1d0045b9d056fd08c4683c34c420fa.

It looks like CMake 3.10.1 is in the process of being released. While we
wait for them to put together that build, I'll just revert this real
quick. It's nice to keep them all at the same version, but we really
just needed a new one for Android.

Change-Id: I01b5a54b65df2194d7b84c825dfdcf0fb87fd06b
Reviewed-on: https://boringssl-review.googlesource.com/24144
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/util/bot/UPDATING b/util/bot/UPDATING
index 815a064..7162f94 100644
--- a/util/bot/UPDATING
+++ b/util/bot/UPDATING
@@ -39,7 +39,11 @@
     https://cmake.org/download/. Use the file labeled "Windows ZIP". The
     download will be named cmake-VERSION-win32-x86.zip.
 
-    The current revision is cmake-3.10.0-win32-x86.zip.
+    The current revision is cmake-3.5.0-win32-x86.zip.
+
+    TODO(davidben): The update to CMake 3.10 on Windows was rolled back due to a
+    CMake bug. Update to 3.10.1 when that is released.
+    https://github.com/Kitware/CMake/commit/f969f1a9ce1d0045b9d056fd08c4683c34c420fa
 
 perl-win32.zip: Update to the latest 32-bit prebuilt "Portable" edition of
     Strawberry Perl, found at http://strawberryperl.com/releases.html. The
diff --git a/util/bot/cmake-win32.zip.sha1 b/util/bot/cmake-win32.zip.sha1
index 8a87ebc..6bb460e 100644
--- a/util/bot/cmake-win32.zip.sha1
+++ b/util/bot/cmake-win32.zip.sha1
@@ -1 +1 @@
-aec1f8385f8cca8a3b5d612d86d4e6e52b4a115d
\ No newline at end of file
+ed4e1939d246374b0bae724a1a4200fd60e7efe8
\ No newline at end of file