fix(windows) yarnpkg#5349 node and yarn can't be launch on Windows in…

…to mingw64

As npm workaround, launch node.exe

See also https://github.com/npm/cli/blob/bd2721dbc3de13a5ba889eba50644475d80f6948/bin/npm

bin/yarn

@@ -2,18 +2,23 @@
 argv0=$(echo "$0" | sed -e 's,\\,/,g')
 basedir=$(dirname "$(readlink "$0" || echo "$argv0")")
 
+is_mingw64_or_cygwin=0
+
 case "$(uname -s)" in
   Darwin) basedir="$( cd "$( dirname "$argv0" )" && pwd )";;
   Linux) basedir=$(dirname "$(readlink -f "$0" || echo "$argv0")");;
-  *CYGWIN*) basedir=`cygpath -w "$basedir"`;;
-  *MSYS*) basedir=`cygpath -w "$basedir"`;;
+  *CYGWIN*) basedir=`cygpath -w "$basedir"` ; is_mingw64_or_cygwin=1 ;;
+  *MSYS*) basedir=`cygpath -w "$basedir"` ; is_mingw64_or_cygwin=1 ;;
 esac
 
 command_exists() {
   command -v "$1" >/dev/null 2>&1;
 }
 
-if command_exists node; then
+if [ "$YARN_FORCE_WINPTY" != 1 ] && [ "$is_mingw64_or_cygwin" = 1 ] && command_exists "node.exe" ; then
+  exec node.exe "$basedir/yarn.js" "$@"
+  ret=$?
+elif command_exists node; then
   if [ "$YARN_FORCE_WINPTY" = 1 ] || command_exists winpty && test -t 1; then
     winpty node "$basedir/yarn.js" "$@"
   else