Windows Cross build fails because pspp executable is required during build

[Friedrich Beckmann]

Hi,

i completely forgot that the windows build is a cross build, i.e. pspp.exe can 
of course not be executed on the build machine. The current build process fails 
with

====
(cd ./examples \
         && 
/home/pspp/pspp-master-20201117/pspp-1.5.2-gc04cd4/src/ui/terminal/pspp.exe 
../doc/examples/autorecode.sps -o - -O format=spv) > 
doc/examples/autorecode.spv.tmp
/bin/sh: line 1: 
/home/pspp/pspp-master-20201117/pspp-1.5.2-gc04cd4/src/ui/terminal/pspp.exe: 
cannot execute binary file: Fehler im Format der Programmdatei
make[2]: *** [Makefile:14217: doc/examples/autorecode.spv] Error 126
make[2]: Leaving directory '/home/pspp/pspp-master-20201117/pspp-1.5.2-gc04cd4'
make[1]: *** [Makefile:12303: all-recursive] Error 1
make[1]: Leaving directory '/home/pspp/pspp-master-20201117/pspp-1.5.2-gc04cd4'
make: *** [Makefile:6401: all] Error 2
Uncaught exception from user code:
        system 'Mingw32-make'  failed: 512 at ./buildpspp4windows.pl line 568, 
<FILE> line 937.
        main::ProcMake() called at ./buildpspp4windows.pl line 369
        main::ProcGeneratePSPP("w32", "Debug") called at ./buildpspp4windows.pl 
line 124
program finished with exit code 2
elapsedTime=419.754343

===

While executing a simple „make“ 

https://github.com/fredowski/pspp-buildbot/blob/master/win/buildpspp4windows.pl#L568

Any ideas how this can be avoided? Aren’t this examples for the documentation, 
i.e. could that be part of the doc target?

http://caeis.etech.fh-augsburg.de:8010/#/builders/7/builds/95

Fritz