Because absolute addresses aren't relocated, make sure that the source address (#112)

for the initialised zero page isn't absolute --- LOADADDR() returns absolute
addresses.

Co-authored-by: dg <dg>

Author: davidgiven

mos-platform/cpm65/link.ld

@@ -46,7 +46,9 @@ SECTIONS {
 		*(.zp.data .zp.data.*)
 		*(.zp.rodata .zp.rodata.*)
 	} >zp AT>ram :init
-	INCLUDE zp-data-symbols.ld
+	__zp_data_load_start = ADDR(.text) + 
+		(LOADADDR(.zp.data) - LOADADDR(.text));
+	__zp_data_size = SIZEOF(.zp.data);
 
 	.pblock (NOLOAD) : {
 		_pblock = .;