[PATCH v2 app-xkbcomp] config: allow to build tarball when yacc is missing

[Daniel Stone]

On Sun, Jul 11, 2010 at 01:57:43PM -0400, Gaetan Nadon wrote:
> Autoconf does not handle this scenario as well as Automake does.
> If xkbparse.c is already there, do not abort the configuration
> if yacc is missing as it is not needed.
> 
> If both xkbparse.c and yacc are missing, abort configuration.
> Yacc is a required tool to build the package.
> 
> Reported-by: Julien Cristau <jcristau at debian.org>
> Signed-off-by: Gaetan Nadon <memsize at videotron.ca>

Survives distcheck and works as intended, so pushed.

Cheers,
Daniel
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