add wxDL_QUIET flag; use RawGetSymbol() instead of GetSymbol() in wxDL_INIT_FUNC to avoid error messages for missing functions (this is also consistent with wxDL_INIT_FUNC_AW)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51032 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/dynlib.tex

@@ -167,6 +167,8 @@ be a combination of the following bits:
 \twocolitem{wxDL\_VERBATIM}{don't try to append the appropriate extension to
 the library name (this is done by default).}
 \twocolitem{wxDL\_DEFAULT}{default flags, same as wxDL\_NOW currently}
+\twocolitem{wxDL\_QUIET}{don't log an error message if the library couldn't be
+loaded.}
 \end{twocollist}
 
 Returns \true if the library was successfully loaded, \false otherwise.