Remove const qualifiers applied to POD return values, as these are meaningless and ignored by the compiler and are therefore potentially misleading. (They also trip -Wignored-qualifiers.)
Add missing link to CMAKE_DL_LIBS to resolve link errors from clew.c using dlopen and friends but failing to link to libdl. Fixes #787.
Make the dtor of b3DynamicBvhBroadphase virtual, to match that the type has other virtual methods. This silences a -Wvirtual-dtor warning.
Matthew Woehlke