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[cc2] Remove rtype field from Type

We are going ot have only one rtype at the same time,
because it is the return type of the current function,
so it is a bit stupid to waste 2/4/8 bytes of every symbol
for this.

--- a/cc2/arch/qbe/code.c

+++ b/cc2/arch/qbe/code.c

@@ -276,7 +276,7 @@

 	if (curfun->kind == SGLOB)

 		fputs("export ", stdout);

-	printf("function %s %s(", size2asm(&curfun->rtype), symname(curfun));

+	printf("function %s %s(", size2asm(&rtype), symname(curfun));

 	/* declare formal parameters */

 	for (sep = "", p = locals; p; p = p->next, sep = ",") {

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -132,7 +132,6 @@

 struct symbol {

 	Type type;

-	Type rtype;

 	unsigned short id;

 	unsigned short numid;

 	char *name;

@@ -217,6 +216,7 @@

 extern void freesym(Symbol *sym);

 /* globals */

+extern Type rtype;

 extern Symbol *curfun;

 extern Symbol *locals;

 extern Inst *pc, *prog;

--- a/cc2/node.c

+++ b/cc2/node.c

@@ -10,6 +10,7 @@

 #define NNODES   32

 Symbol *curfun;

+Type rtype;

 struct arena {

 	Node *mem;

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -537,7 +537,7 @@

 	sym->name = name;

 	sym->type = *tp;

 	if (tp->flags & FUNF)

-		sym->rtype = *rp;

+		rtype = *rp;

 	sym->kind = sclass;

 	if (ininit)

-- 

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