callweaver: follow upstream from openpbx.org to callweaver.org and update to rc5

callweaver: follow upstream from openpbx.org to callweaver.org and update to rc5
* openpbx.org is gone and thus fetching failed.
* upgrade to rc5 since rc3 is no longer available
* Follow upstream rename of project from openpbx.org to callweaver.org.  replace
  all occurences of the openpbx string with callweaver in all files.
* drop unneeded patches and create new ones (fix version check code)
* drop openldap support and DEPENDS until bug 2806 is fixed to enable the package
  to build in OE
* fix packaging
* this is the "boy, am I glad I got it off the 'mtn status'-radar"-commit