[Bug bootstrap/105831] Nonportable syntax in "test" and "[" commands.

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105831

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note I think most folks on AIX, uses CONFIG_SHELL=bash due to the speed of
/bin/sh and configure :
https://gcc.gnu.org/install/specific.html#x-ibm-aix

So the patch to configure.ac while good does not do much.

And IIRC nvptx target is really only tested on GNU/Linux so nvptx/gen-opt.sh
will most likely only be invoked with bash (dash?).

So while good, will not do much.