[PATCH lib/libXpm] Define NO_ZPIPE when building for MinGW

[Ángel González]

On 22/10/12 17:07, Jon TURNEY wrote:
> Define NO_ZPIPE when building for MinGW, decompressing via a pipe isn't possible
> 
> Signed-off-by:  Jon TURNEY <jon.turney at dronecode.org.uk>

This seems a bit strong statement. There's no reason for decompression
via pipe not to work under Windows. You only need to be careful to do
that using a binary stream, plus xpmPipeThrough needing a windows
implementation, since it is currently fork()-based.