[syslinux] Patches from Debian

[Lukas Schwaighofer]

Hi,

I've recently started working on the syslinux package on Debian.  I
noticed there are a few patches applied to the Debian version which
seem generally useful to me.  Please consider merging them:

* 0001-digest-sha.patch: It appears that "Digest::SHA1" has been
  superseded by "Digest:SHA".
* 0003-extlinux-manpage.patch: Updates to the extlinux man page.
* 0009-reproducible-build.patch: More reproducible order (most of it
  was already solved in be645d7a9848847388a662f6c0f7571d52ed7a05).
* 0015-reproducible-timestamps.patch: use SOURCE_DATE_EPOCH
  environment variable [1], if available, to create reproducible mtimes
  in the files created by bin2c.pl.

Note that the attached patches are not identical to the ones in
Debian's syslinux source package:  I've rebased them against current
syslinux git HEAD and dropped parts that have become unnecessary or
were already applied.  And I've just now updated the extlinux man page a
bit :) .

Thank you
Lukas

[1] https://reproducible-builds.org/specs/source-date-epoch/
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