Update install-mingw.sh

Author: ChrisDenton

src/ci/scripts/install-mingw.sh

@@ -42,5 +42,6 @@ if isWindows && isKnownToBeMingwBuild; then
 
     curl -o mingw.7z "${MIRRORS_BASE}/${mingw_archive}"
     7z x -y mingw.7z > /dev/null
+    ciCommandSetEnv MSYS2_PATH_TYPE inherit
     ciCommandAddPath "$(pwd)/${mingw_dir}/bin"
 fi