core: Minor cleanup in engine-gpg and -gpgsm.
* src/engine-gpg.c: Remove errno.h. (build_argv): Use gpg_error_from_syserror instead of ERRNO. * src/engine-gpgsm.c: Remove errno.h. (status_handler): Remove check for EINTR; gpgme_data_write already handles EINTR.
- Signed-off-by: Werner Koch <wk@gnupg.org>