Fix various new compiler warnings.

terminalfunctions.cc: set_if_available() was undeclared.
Fix printf() wint_t/wchar_t warnings.
mosh-server.cc: Fix warning for side effects inside typeid().

Signed-off-by: John Hood <cgull@glup.org>

src/terminal/parseraction.cc

@@ -43,7 +43,7 @@ std::string Action::str( void )
   char thechar[ 10 ] = { 0 };
   if ( char_present ) {
     if ( iswprint( ch ) )
-      snprintf( thechar, 10, "(%lc)", ch );
+      snprintf( thechar, 10, "(%lc)", (wint_t)ch );
     else
       snprintf( thechar, 10, "(0x%x)", (unsigned int)ch );
   }