messages: resolve module name at link-time
Within all the introduced static libraries, the module cannot be known at compilation time. This moves the module name from a compilation constant to a link time constant string symbol. That way, the same compiled object within a static library can use a different and correct module name depending on which plugin it is linked into. The symbol is hidden so it does not leak between shared objects. For non-plugins shared libraries (vlccore, vlc, vlc_pulse and vlc_xcb_events) the module name must be defined manually, unless the library does not use msg_* macros at all (vlc_vdpau).
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