bug#18612: [platform-testers] Emacs pretest 24.3.94

[Eli Zaretskii]

> Date: Thu, 02 Oct 2014 15:22:41 -0400
> From: Assaf Gordon <assafgordon@gmail.com>
> 
> On thing I noticed, is that "configure.ac" (and thus "./configure")
> has the following statement (line 38):
>      srcdir="/${srcdir:0:1}${srcdir:2}"
> 
> I believe these are bash-specific variable expansions, not posix-compatible.
> 
> This appears in an MINGW-related "if" block, so I guess most of the time it 
> is not encountered.

MinGW uses only Bash.