Reminder: This patch adds support for more characters that are special to GNU make in file-names. Especially GNU make expects in rules that #, %, :, *, ? and [ characters are preceded by a backslash to remove their special meaning.
The original mails are: https://gcc.gnu.org/pipermail/gcc-patches/2025-August/693057.html and https://gcc.gnu.org/pipermail/gcc-patches/2025-August/692869.html
