[Bug modula2/127359] building modula2 support requires bash installed in path

[gaius at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127359

--- Comment #2 from Gaius Mulley <gaius at gcc dot gnu.org> ---
Created attachment 65585
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65585&action=edit
Proposed fix  removing bash dependency from libgm2

Here is a proposed patch removing invocation of bash from libgm2.
Bootstrapped tested on amd64 Debian (with bash).  More tests needed (without
bash).