%define variables: backward compatibility

* src/muscle-tab.c (muscle_percent_variable_update): Accept lex_symbol.
Reported by Roland Levillain.

THANKS

@@ -106,6 +106,7 @@ Ralf Wildenhues           [email protected]
 Richard Stallman          [email protected]
 Rob Vermaas               [email protected]
 Robert Anisko             [email protected]
+Roland Levillain          [email protected]
 Satya Kiran Popuri        [email protected]
 Sebastian Setzer          [email protected]
 Sebastien Fricker         [email protected]

src/muscle-tab.c

@@ -399,6 +399,7 @@ muscle_percent_variable_update (char const *variable, location variable_loc)
     {
       { "api.push_pull", "api.push-pull", },
       { "api.tokens.prefix", "api.token.prefix", },
+      { "lex_symbol", "api.token.constructor", },
       { "location_type", "api.location.type", },
       { "lr.default-reductions", "lr.default-reduction", },
       { "lr.keep-unreachable-states", "lr.keep-unreachable-state", },