libselinux/src/Makefile: don't pass bogus -I and -L to python setup.py build_ext

Using $(DESTDIR) during the build does not follow the normal/standard
semantic of DESTDIR: it is normally only needed during the
installation. Therefore, a lot of build systems/environments don't
pass any DESTDIR at build time, which causes setup.py to be called
with -I /usr/include -L /usr/lib, which breaks cross-compilation.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
1 file changed