build: Remove configure option --enable-gpg-is-gpg2
* configure.ac (--enable-gpg-is-gpg2): Remove option. (USE_GPG2_HACK): Remove var. * common/homedir.c (gnupg_module_name): Remove code for gpg2 installation option. * g10/keygen.c (generate_keypair): Ditto. * g10/Makefile.am (noinst_PROGRAMS): Ditto. * doc/gpg.texi: Ditto. * doc/gpgv.texi: Ditto.
This option and all its build stuff does not make anymore sense. gpg1
is way too old for anyone to use on a regualar base along with a
standard gpg. It is better to rename that single gpg (1.4) binary to
gpg1 and adjust any scripts.