try deal with dependencies for makedepends

Example.
foo-dev is a makedepends which depends on foo. We need to install foo before
we can install foo-dev.

The way we deal with thi here is hackish and should be replaced by adding
all built packages to an abuild repository or similar.

the dependency repo tells apk index that dependencies are found
in another repository.

now its possible to build alpine iso with uncommitted developer abuild apk.

This script helps developers who works on the alpine subprojects (i.e
apk-tools, alpine-baselayout etc) to build a development alpine iso.

a new alpine iso using the un-committed local sub

this is just a wrapper script. the real stuff happens in alpine.mk

also link mkiso to use the makefile

tries to get correct dependencies for modloop, initramfs and iso
so minimum amount of work is required for rebuild.

Also any /usr/share/gettext dir.

This reverts commit b27a6f47.

this avoids rebuilding those unless its needed