Prefer GnuPG-2 engines over GnuPG-1.
* src/util.h: Move some prototypes to ... * src/sys-util.h: New. * src/Makefile.am (main_sources): Add sys-util.h. * configure.ac (AH_VERBATIM): Add DIRSEP_C and DIRSEP_S. * src/dirinfo.c: Include sys-util.h. (WANT_GPG_NAME, WANT_GPGSM_NAME, WANT_G13_NAME) (WANT_UISRV_SOCKET): New. (dirinfo): Add corresponding fields. (parse_output): Add arg COMPONENTS and set new fields. (read_gpgconf_dirs): Add arg components and act upon it. (get_gpgconf_item): Call read_gpgconf_dirs two times. Add debug output. (_gpgme_get_default_gpg_name): New. (_gpgme_get_default_gpgsm_name): New. (_gpgme_get_default_g13_name): New. (_gpgme_get_default_gpgconf_name): New. (_gpgme_get_default_uisrv_socket): New. * src/engine-gpg.c, src/engine-g13.c, src/engine-gpgconf.c * src/engine-gpgsm.c, src/engine-uiserver.c: Change to use _gpgme_get_default_ instead of those from sys-util.h. * src/posix-util.c (_gpgme_get_gpg_path): Include sys-util.h. (_gpgme_get_uiserver_socket_path): Remove. * src/w32-util.c (_gpgme_get_gpg_path): Include sys-util.h. (_gpgme_get_uiserver_socket_path): Remove.
The default engines names are now taken from the output of gpgconf.
If gpgconf is not installed gpg 1 is assumed and locate the same was
as gpgconf.