[Elphel-support] Fix dropbear & cris-dist

[Luc Deschenaux]

Hi Oleg !

Compiling newer versions of dropbear for the Elphel 353 firmware using
the crisv32 compiler was failing with "bignum invalid" errors.

Last time I had to remove some "useless" code from dropbear in order to
compile it successfuly.

This time instead I patched the crisv32 assembler with the attached
cris-dist patch, according to 
http://mhonarc.axis.se/dev-etrax/msg09904.html  (see attached html)

To recompile the cris-dist package successfully we just had to setup a
virtual machine with VirtualBox, installing a minimal Debian wheezy
(base system only) using debian-7.9.0-amd64-netinst.iso image, followed
with only
    apt-get install  build-essential

then added the following line

    patch -p0 < ../cris-dist-1.64-bignum.patch

to

    http://wiki.elphel.com/index.php?title=Elphel_Software_Kit_for_Ubuntu#Downloading_and_unpacking_gcc-cris


For dropber, only an additional CLOCK_MONOTONIC=1 definition was needed
in order to compile the latest release (see attached dropbear patch)

Concerning cris-dist, it should be easy for the Elphel PPA maintainer to
update the package on https://launchpad.net/~elphel/+archive/ubuntu/ppa 
(adding the bignum patch and rebuild the binary package)

If anybody need it in the meanwhile I can send a link by mail for the
cris-dist deb package I built using checkinstall/Makefile/tar ...

Best to you,

Luc

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