libraries/cffi: Only build for python2.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

libraries/cffi/cffi.SlackBuild

@@ -80,12 +80,7 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
 
-python setup.py install --root=$PKG
-
-# Python 3 support.
-if $(python3 -c 'import sys' 2>/dev/null); then
-  python3 setup.py install --root=$PKG
-fi
+python2 setup.py install --root=$PKG
 
 find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
   | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true