mongrel2: Bump version and change hosting

mongrel2 has changed it's repository.
It was also the opportunity to bump it.
Adding a hash, since we use this packages as an example for the hash in
the manual, it was a bit shamefull that it did not have a proper hash.

Remove 0001-use-CC-variable-to-compile-procer.patch, an equivalent was
applied upstream:
https://github.com/mongrel2/mongrel2/commit/eafe3cf3efde4278040f38b5808f336e3d102c84



Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Reviewed-by: Lionel Orry <lionel.orry@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>