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Add stub of addresability of OADD and OSUB

This is only a stub, and it is not clear what I have to do, but
it is first step.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -43,6 +43,8 @@

 #define STATIC 'S'

 #define CONST '#'

 #define LABEL 'L'

+#define OADD  '+'

+#define OSUB  '-'

 extern void error(unsigned nerror, ...);

 extern void genaddable(Node *list[]);

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -15,11 +15,15 @@

 static void

 xaddable(Node *np)

 {

+	Node *lp, *rp;

+

 	if (!np)

 		return;

 	np->complex = 0;

 	np->addable = 0;

+	lp = np->left;

+	rp = np->right;

 	switch (np->op) {

 	case AUTO:

 		np->addable = 11;

@@ -33,6 +37,10 @@

 	case CONST:

 		np->addable = 20;

 		break;

+	case OADD:

+	case OSUB:

+		xaddable(lp);

+		xaddable(rp);

 	}

 }