update to 2.4.0 (#2155170)
    
    Rebase the patch which allows importing of keys without UIDs.  The code
    changed slightly with upstream 7aaedfb10 (gpg: Import stray revocation
    certificates., 2022-10-28).
    
    Bump the minimum required libksba to 1.6.3, per upstream fc8b81128
    (Update NEWS for 2.4.0, 2022-12-16).  Also increase libgpg-error to
    1.46, per upstream c51139f2b (agent,w32: Support Win32-OpenSSH emulation
    by gpg-agent., 2022-10-14).
    
    Fix broken GPGME tests with the patch attached to T6313¹.  The patch is
    edited to apply the changes to Makefile.in rather than Makefile.am.
    That avoids the need to run autoreconf.
    
    ¹ https://dev.gnupg.org/T6313#166375