Fix build with -fno-common

Index: src/asmrule.h
--- src/asmrule.h.orig
+++ src/asmrule.h
@@ -53,7 +53,7 @@ enum {
     S_LPAREN,
     S_RPAREN,
   
-} symbols;
+};
 
 
 
@@ -74,7 +74,7 @@ enum {
     O_ID, /* $Bandwidth or $OLDfoobar */
     O_NUM,
   
-} operators;
+};
 
 
 struct c_desc { /* condetion_desc */