configure: Exit when running on Windows

[sschuberth]

Fixes #1875.

Signed-off-by: Sebastian Schuberth sschuberth@gmail.com

[codecov]

Codecov Report

Merging #1883 into develop will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1883      +/-   ##
===========================================
+ Coverage    78.97%   78.97%   +<.01%     
===========================================
  Files          131      131              
  Lines        16924    16924              
===========================================
+ Hits         13365    13366       +1     
+ Misses        3559     3558       -1

Impacted Files	Coverage Δ
src/textcode/markup.py	93.61% <0%> (-2.13%)	⬇️
src/licensedcode/query.py	75.66% <0%> (-0.27%)	⬇️
src/typecode/contenttype.py	84.63% <0%> (-0.25%)	⬇️
src/licensedcode/index.py	73.42% <0%> (-0.23%)	⬇️
src/licensedcode/match.py	78.43% <0%> (+0.12%)	⬆️
src/scancode/cli.py	77.24% <0%> (+0.27%)	⬆️
src/scancode/api.py	96.81% <0%> (+1.27%)	⬆️

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[pombredanne]

@sschuberth thank you ++!