tests/openpgp: Reimplement 'pinentry.sh' in c.
* tests/openpgp/Makefile.am: Build new program. * tests/openpgp/defs.inc: Use the new program. * tests/openpgp/fake-pinentry.c: New file.
Building an executable that does not require an interpreter makes it
easier to use on Windows.
- Signed-off-by: Justus Winter <justus@g10code.com>