Stop adding MSYS2 to PATH

Rust no longer requires MSYS2 tools like make.

src/ci/scripts/install-mingw.sh

@@ -47,12 +47,6 @@ if isWindows && isKnownToBeMingwBuild; then
             ;;
     esac
 
-    # Stop /msys64/bin from being prepended to PATH by adding the bin directory manually.
-    # Note that this intentionally uses a Windows style path instead of the msys2 path to
-    # avoid being auto-translated into `/usr/bin`, which will not have the desired effect.
-    msys2Path="c:/msys64"
-    ciCommandAddPath "${msys2Path}/usr/bin"
-
     case "${mingw_archive}" in
         *.7z)
             curl -o mingw.7z "${MIRRORS_BASE}/${mingw_archive}"
@@ -73,12 +67,4 @@ if isWindows && isKnownToBeMingwBuild; then
     esac
 
     ciCommandAddPath "$(cygpath -m "$(pwd)/${mingw_dir}/bin")"
-
-    # MSYS2 is not installed on AArch64 runners
-    if [[ "${CI_JOB_NAME}" != *aarch64-llvm* ]]; then
-        # Initialize mingw for the user.
-        # This should be done by github but isn't for some reason.
-        # (see https://github.com/actions/runner-images/issues/12600)
-        /c/msys64/usr/bin/bash -lc ' '
-    fi
 fi