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Some changes in function names

We were calling struct_spec to the function called from spec, but we
were calling union_dcl to the similar function for unions, and it was
confusing, because struct_dcl was the function where struct fields
were defined. This patch change struct_dcl to field_dcl, and struct_spec
to struct_dcl, so the code is more clever now.

--- a/decl.c

+++ b/decl.c

@@ -101,10 +101,10 @@

 	tp->sym = sym;

 }

-static struct ctype * spec(void);

+static struct ctype *spec(void);

 static struct ctype *

-struct_dcl(unsigned char ns)

+field_dcl(unsigned char ns)

 {

 	register struct ctype *tp, *base;

@@ -141,7 +141,7 @@

 }

 static struct ctype *

-struct_spec(register struct ctype *tp)

+struct_dcl(register struct ctype *tp)

 {

 	new_struct(tp);

@@ -151,7 +151,7 @@

 		error("struct/union already defined");

 	do

-		struct_dcl(tp->ns);

+		field_dcl(tp->ns);

 	while (!accept('}'));

 	tp->forward = 0;

@@ -214,7 +214,7 @@

 		case STRUCT:   case UNION:

 			tp = btype(tp, yytoken);

 			next();

-			return struct_spec(tp);

+			return struct_dcl(tp);

 		case IDEN:

 			if (!tp || !tp->type) {

 				struct symbol *sym;