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[cc2] Add missing * case to assign subop

This fixes *= assignment, which previously triggered a stack underflow.

Also, re-order the cases to match optbl.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -253,10 +253,11 @@

 	Node *np = newnode(u.op);

 	switch (subop = *++token) {

-	case '/':

-	case '%':

 	case '+':

 	case '-':

+	case '*':

+	case '%':

+	case '/':

 	case 'l':

 	case 'r':

 	case '&':

--- a/tests/execute/0037-assignop.c

+++ b/tests/execute/0037-assignop.c

@@ -9,9 +9,12 @@

 	x += 2;

 	if (x != 4)

 		return 1;

-	x -= 3;

-	if (x != 1)

+	x -= 1;

+	if (x != 3)

 		return 2;

+	x *= 2;

+	if (x != 6)

+		return 3;

 	return 0;

 }