[Gnash-dev] lightweighted mutexes vs. real mutexes

[strk]

I've started use of boost::thread in movie_def_impl.
I suggest we switch all mutexes/threads to boost
for consistency. The 'lightweighted' mutexes we've been
using are not fully documented so I suggest we avoid
their use.

The dark side is that *real* mutexes require the boost
thread lib, whereas the *lightweighted* ones only needed
headers. No big deal though as the autoconf scripts already
check for it, so just add BOOST_LIBS to the Makefile.am
when you use boost threads.

Reference: http://www.boost.org/doc/html/threads.html

--strk; 

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