folly: import PushCheckState cmake module

Summary: D23695665 (https://github.com/facebook/folly/commit/5c3b9d59a815b94df1afed0b7e0050bb75e09178) calls functions defined by this module, but doesn't ensure that it has been imported. I believe this to be the reason behind this build failure: https://github.com/facebook/watchman/pull/856/checks?check_run_id=1135919864#step:52:217 Reviewed By: chadaustin Differential Revision: D23794292 fbshipit-source-id: 897cfac862fda7420d1c53b0976492231b53dcf8

folly: import PushCheckState cmake module
Summary: D23695665 (https://github.com/facebook/folly/commit/5c3b9d59a815b94df1afed0b7e0050bb75e09178) calls functions defined by this module, but doesn't ensure that it has been imported. I believe this to be the reason behind this build failure: https://github.com/facebook/watchman/pull/856/checks?check_run_id=1135919864#step:52:217 Reviewed By: chadaustin Differential Revision: D23794292 fbshipit-source-id: 897cfac862fda7420d1c53b0976492231b53dcf8
fb5ce2d9 · Wez Furlong · Facebook GitHub Bot · c5d1c45f · fb5ce2d9
Commit fb5ce2d9 authored Sep 18, 2020 by Wez Furlong Committed by Facebook GitHub Bot Sep 18, 2020
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CMake/folly-deps.cmake CMake/folly-deps.cmake +1 -0

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--- a/CMake/folly-deps.cmake
+++ b/CMake/folly-deps.cmake
@@ -16,6 +16,7 @@ include(CheckCXXSourceCompiles)
 include(CheckCXXSymbolExists)
 include(CheckIncludeFileCXX)
 include(CheckFunctionExists)
+include(CMakePushCheckState)

 set(
  BOOST_LINK_STATIC "auto"