Add missing #include <stdint.h>
Add missing #include <stdint.h>

We use the uintptr_t type, so we should be including the appropriate
header file.

Recent versions of gpg-error.h include stdint.h, so this works out;
older versions, like in RHEL 7, do not.

proglottis/gpgme,cortex/gpgme,cortex/gpgme,mtrmac/gpgme,mtrmac/gpgme,proglottis/gpgme