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[cc2-z80] Export/Import symbols

EXTRN is used to declared variables that are defined in another
module (or maybe in the same module), while PUBLIC it is used
to declare that a variable defined in the module must be
exported and being public for the other modules.

--- a/cc2/arch/z80/code.c

+++ b/cc2/arch/z80/code.c

@@ -38,7 +38,9 @@

 label(Symbol *sym)

 {

 	int seg, flags = sym->type.flags;

+	char *name = symname(sym);

+	putchar('\n');

 	if (flags & FUNF)

 		seg = CODESEG;

 	else if (flags & INITF)

@@ -47,7 +49,16 @@

 		seg = BSSSEG;

 	segment(seg);

-	printf("%s:\n", symname(sym));

+	switch (sym->kind) {

+	case EXTRN:

+		printf("\tEXTRN %s\n", name);

+		return;

+	case GLOB:

+		printf("\tPUBLIC %s\n", name);

+		break;

+	}

+

+	printf("%s:\n", name);

 }

 static void