[Bug modula2/110002] Using -fcpp only invokes cc1 from pre-configured path $(libexec)

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110002

--- Comment #1 from Thorsten Otto <ad...@tho-otto.de> ---
When using -fcpp, gm2cc1 invokes cc1 only from the configured $(libexec)
directory, eg. /usr/lib64/gcc/x86_64-suse-linux/13/cc1. But when installed in a
different directory, it should use
<installdir>/../lib64/gcc/x86_64-suse-linux/13/cc1 first, like the driver does.