doc: Install gpg and gpgv man pages under the correct name.
* doc/mkdefsinc.c (main): Add double include guard. Set variable gpgtwohack. Define macros gpgname and gpgvname. * doc/gpg.texi: Remove macro definition for gpgname. Use Texinfo var gpgtwohack to prepare the man pages. Use @gpgname everywhere. * doc/gpgv.texi: Likewise. * doc/Makefile.am (myman_pages): Remove gpg2.1 and gpgv2.1 but add them depending on USE_GPG2_HACK.
- Signed-off-by: Werner Koch <wk@gnupg.org>