python: Fix build in certain cases.
python: Fix build in certain cases.

* lang/python/setup.py.in: Prepend the Python build dir to the list of
include directories so that it takes precedence over any other include
directory.
--
Fixes the build in case an older 'gpgme.h' is installed and is picked
up by the compiler when compiling the Python module.

Signed-off-by: Justus Winter <4d1bd7a5ca1cd26bee0df05b6801a6ce9a22196e@g10code.com>

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme