Use an automake variable for server building

Since automake knows all possible values of this variable
up front, it can determine what goes into DIST_SUBDIRS
automagically.
cleanup polar update
Remove outdated bootstrap.freebsd script

The normal bootstrap script works just fine
Merge pull request #1815 from rubenk/remove-bootstrap.freebsd

Remove outdated bootstrap.freebsd script
Merge pull request #1813 from mind04/polar-cleanup

cleanup polar update
Merge pull request #1779 from rubenk/use-automake-variable-for-server-building

Use an automake variable for server building
Cleanup the rest of the Makefile.am's