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[as-z80] Add unconditional absolute branches

--- a/as/target/x80/ins.c

+++ b/as/target/x80/ins.c

@@ -246,15 +246,14 @@

 void

 imm16(Op *op, Node **args)

 {

-	Node *par1, *par2;

+	Node *imm;

 	unsigned char buf[4];

 	unsigned val;

 	int n = op->size;

-	par2 = args[1];

-

+	imm = (args[1]) ? args[1] : args[0];

 	memcpy(buf, op->bytes, n);

-	val = par2->sym->value;

+	val = imm->sym->value;

 	buf[n-1] = val >> 8;

 	buf[n-2] = val;

 	emit(buf, n);

--- a/as/target/z80/test.s

+++ b/as/target/z80/test.s

@@ -193,7 +193,7 @@

 	RET	%NZ	/ C0

 	POP	%BC	/ C1

 	JP	%NZ,16384	/ C2 00 40

-/C3 n n	JP nn

+	JP	32768	/ C3 00 80

 	CALL	%NZ,32768	/ C4 00 80

 	PUSH	%BC	/ C5

 	ADD	%A,32	/ C6 20

@@ -458,7 +458,7 @@

 	SET	7,(%HL)	/ CB FE

 	SET	7,%A	/ CB FF

 	CALL	%Z,16384	/ CC 00 40

-/CD n n	CALL nn

+	CALL	16384	/ CD 00 40

 	ADC	%A,64	/ CE 40

 	RST	8	/ CF

 	RET	%NC	/ D0