Auto merge of #149601 - mati865:no-msys2-take2, r=<try>

Stop adding MSYS2 to PATH, take 2

try-job: i686-pc-windows-gnu
try-job: aarch64-pc-windows-gnullvm

Author: rust-bors[bot]

src/ci/scripts/install-mingw.sh

@@ -66,5 +66,5 @@ if isWindows && isKnownToBeMingwBuild; then
             ;;
     esac
 
-    ciCommandAddPath "$(cygpath -m "$(pwd)/${mingw_dir}/bin")"
+    ciCommandAddPath "$(pwd)/${mingw_dir}/bin)"
 fi