shipping with sformat 3.5 for building sformat; the former include their
own version of __dtoa() which is no longer externally visible with libc
symbol versioning turned on (thus breaking the build of stock sformat).
- While here also use MASTER_SITE_LOCAL for providing a backup mirror of
the sformat 3.5 distfile instead of using a private one.
- Fix the checksumming of sformat.dat on LP64 platforms so sformat doesn't
erroneously complain about that file containing uncertified data there.
Bump PORTREVISION for this.
Approved by: netchild
12657ca8d2