Added EXTERN_C to MRCP_PLUGIN_DECLARE macro, required for C++ plugins  issue-15
Added EXTERN_C to MRCP_PLUGIN_DECLARE macro, required for C++ plugins 
issue-15
andrenatal/unimrcp,qboss/unimrcp,iitdlaxman/unimrcp,AaronZhangL/unimrcp,AaronZhangL/unimrcp,qboss/unimrcp,iitdlaxman/temp,MattRiddell/unimrcp,andrenatal/unimrcp,AaronZhangL/unimrcp,MattRiddell/unimrcp,iitdlaxman/unimrcp,pgaval/unimrcp,iitdlaxman/unimrcp,iitdlaxman/temp,andrenatal/unimrcp,pgaval/unimrcp,MattRiddell/unimrcp,pgaval/unimrcp,iitdlaxman/temp,qboss/unimrcp