request add db45/db46 support to mail/exim port

[snowcrash+freebsd]

hi,

> Sounds great, just one point: I'd prefer seeing that exim would make use
> of bsd.database.mk.

i /thought/ that use of WITH_BDB_VER/USE_BDB *is* 'making use of'
bsd.database.mk, wherein,

 ...
 .if defined(WITH_BDB_VER)
 . if ${WITH_BDB_VER} == 4
 USE_BDB=    40
 . elif ${WITH_BDB_VER} != 1
 USE_BDB=    ${WITH_BDB_VER}
 . endif
 .endif
 _WANT_BDB_VER=  ${USE_BDB}
 ...

but, changes in exim port may well be required for 'compliance'.

>   I have Cc'ed maintainer (krion@).

thanks!