bug#64806: 29.0.92; build process outside srcdir gets stuck

[Eli Zaretskii]

> Date: Sun, 23 Jul 2023 14:49:26 GMT
> From:  Van Ly via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> When the build process occurs in a directory next to srcdir the make
> phase is unable to complete.  See attached File A, line 549 and 1349.
> 
> Using configure and make within srcdir builds successfully.  See
> attached File Z.
> 
> Steps to reproduce:
> 
>  1. at srcdir being emacs-29.0.92
>  2. run, sh ./autogen.sh
>  3. create build directory outside srcdir, mkdir ../emacs-29
>  4. at build directory, cd ../emacs-29,
>  5. run build process, ../emacs-29.0.92/configure ; make

You configure with

  ../emacs-29.0.92/configure --srcdir=/usr/X/23/pkg/emacs-29.0.92

but the build says

  Entering directory '/mnt/606/2023/pkg/emacs-29'

which doesn't seem to be consistent with the configure command.  I
think this is the reason for the problem you see.