Fix dependency issues for preinst scripts

There is a problem with dependency order when installing packages. The key
problem revolves around the satisfy_dependencies_for() function which is
called from opkg_install_pkg just before the installation (and preinst)
happens.

The satisfy_dependencies_for() function calls pkg_hash_fetch_unsatisfied_dependencies()
which will only return packages which were previously not marked as
*going* to be installed at some point. For the purposes of
opkg_install_pkg() we really need to know which dependencies haven't been
installed yet.

This patch adds pkg_hash_fetch_satisfied_dependencies() which returns a
list of package dependencies. We can then directly check the status of
these and ensure any hard dependencies (not suggestions or recommendations)
are installed before returning.

Consider the situation (where -> means 'depends on'):

X -> A,E
A -> B,E
E -> B
B -> C

Currently X would install A and E. When installing A the packages B, E
and C would be marked as "to install". When the package B is considered
the second time (as a dependency of E rather than A), it would install
straight away even though C was not currently installed, just marked
as needing to be installed.

The patch changes the behaviour so B can't install until C really is installed.

This change is required to run the postinst scripts in the correct order.

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

git-svn-id: http://opkg.googlecode.com/svn/trunk@638 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358

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