Fix VLC{-release}.app generation, make symbolic links to .gmo files in the source tree, not in the build tree

* Don't use dyld functions on darwin by default as they are deprecated.
* Defines HAVE_DYNAMIC_MODULES, and add an entry in the options for it.
* Fix config.h generation (was accidentaly removed).
* Fix FindDlopen.cmake
This produce a working in tree vlc AND an installable vlc at the same time.

generated by running ./preparse imports in asa/lib/import so should
probably not be in source tree, but I don't think asa
generates/installs this file by default yet.

Added build changes for csri module and subtitle_asa.

This is the last remaining changes of equinoxes Summer of Code project

cmake: prefer the use of target_link_libraries() over set_target_properties(LINKFLAGS), make sure we don't use "-z defs --as-needed" on Mac OS X.