Use $(run-program-prefix) in more shell script tests

[Joseph S. Myers]

On Wed, 24 Oct 2012, H.J. Lu wrote:

> I have
> 
> [hjl@gnu-tools-1 tmp]$ echo $SHELL
> /bin/zsh
> [hjl@gnu-tools-1 tmp]$
> 
> Should we set SHELL in config.make?

That seems reasonable, since it's being used in the makefiles and shell 
scripts, though I don't know what the specific zsh issue is, or whether 
autoconf will detect that issue and avoid using zsh as the SHELL value in 
that case.

-- 
Joseph S. Myers
joseph@codesourcery.com