gb: added more vars to crt0

presets/gb/gb/crt0.sgb

@@ -157,15 +157,15 @@ _refresh_OAM::
 
         ;; Cartridge type is ROM only
         .org    0x147
-        .byte   0
+        .byte   GB_MAPPER
 
         ;; ROM size is 32kB
         .org    0x148
-        .byte   0
+        .byte   GB_ROM_SIZE
 
         ;; RAM size is 0kB
         .org    0x149
-        .byte   0
+        .byte   GB_RAM_SIZE
 
         ;; Maker ID
         .org    0x14A

src/worker/platforms.ts

@@ -395,6 +395,9 @@ export var PLATFORM_PARAMS = {
         '-g', '_shadow_OAM=0xC000',
         '-g', '.STACK=0xE000',
         '-g', '.refresh_OAM=0xFF80',
+        '-g', 'GB_MAPPER=0x0',
+        '-g', 'GB_ROM_SIZE=0x0',
+        '-g', 'GB_RAM_SIZE=0x0',
         '-g', 'GB_CGB_FLAGS=0x0',
       ],
       wiz_sys_type: 'gb',