vim: update to 7.3.905

Replace version 7.2.446 with the latest version currently available, 7.3.905.

The old fetch method was inefficient as version 7.2 was downloaded and patches
applied to get to version 7.2.446. Attempting this method with git 7.3 did not
work as not all 905 patches applied cleanly. Instead we fetch version 7.3.905
directly from the upstream mercurial repository. This causes an implicit
dependency on mercurial-native for the build which is reasonable considering
that not many images include vim by default.

The previously used patch configure.in_remove_CC_quotes.patch is still required
as these changes haven't been made upstream; this patch still applies cleanly.

Signed-off-by: Paul Barker <paul@paulbarker.me.uk>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>