[CircleCI] use binutils 2.35 on Windows

Summary:
binutils 2.36 pokes a limitation in ocaml for windows that breaks dynlinking, which we use for our ppx plugins.

cygwin added 2.36 on 4/10, which is why this suddenly broke in 0.149 when the version bump busted our caches. this diff hackily downgrades back to binutils 2.35.

cygwin's CLI doesn't provide a way to install old packages, so I manually download the binaries and extract them on top of the cygwin directory. this would be a bad idea to do to a normal cygwin install, but since we're doing it in a CircleCI image, it doesn't matter that cygwin doesn't know the state of its packages.

ref #8645

Pull Request resolved: #8644

Reviewed By: samwgoldman

Differential Revision: D27843998

Pulled By: mroch

fbshipit-source-id: 9f7461af0147daa44be7ca967c12d3a098f93f04

.circleci/config.yml

@@ -22,10 +22,17 @@ orbs:
           - run:
               name: Install dependencies
               command: |
-                choco install --no-progress cygwin
+                choco install --no-progress cygwin cyg-get 7zip
+                setx /M PATH $($Env:PATH + ';C:\Program Files\7-Zip')
                 if (-not $?) { throw "Failed to install cygwin" }
-                choco install --no-progress rsync patch diffutils curl make zip unzip git m4 perl mingw64-x86_64-gcc-core mingw64-x86_64-gcc-g++ mingw-w64-x86_64-gcc-libs --source=cygwin
+                cyg-get rsync patch diffutils curl make zip unzip git m4 perl mingw64-x86_64-gcc-core mingw64-x86_64-gcc-g++ mingw-w64-x86_64-gcc-libs
                 if (-not $?) { throw "Failed to install deps from cygwin" }
+                $local_packages = "$Env:TEMP\flow\cygwin"
+                New-Item -ItemType Directory $local_packages
+                (New-Object System.Net.WebClient).DownloadFile("https://mirrors.kernel.org/sourceware/cygwin/x86_64/release/mingw64-x86_64-binutils/mingw64-x86_64-binutils-2.35.2-1.tar.xz", "$local_packages\mingw64-x86_64-binutils-2.35.2-1.tar.xz")
+                if (-not $?) { throw "Failed to download mingw64-x86_64-binutils-2.35.2-1" }
+                7z.exe x "$local_packages\mingw64-x86_64-binutils-2.35.2-1.tar.xz" -o"$local_packages" -y
+                7z.exe x "$local_packages\mingw64-x86_64-binutils-2.35.2-1.tar" -o"C:\tools\cygwin" -y
           - run:
               name: Install opam
               command: |