fixes for compiling with gcc 10

gcc 10 no longer lets you get away with not externing global variables in header files. This adds the necessary extern and adds defines in appropriate c files

bootloader/hos/pkg2.c

@@ -36,6 +36,10 @@
 extern hekate_config h_cfg;
 extern const u8 package2_keyseed[];
 
+u32 pkg2_newkern_ini1_val;
+u32 pkg2_newkern_ini1_start;
+u32 pkg2_newkern_ini1_end;
+
 #ifdef KIP1_PATCH_DEBUG
 	#include "../utils/util.h"
 	#define DPRINTF(...) gfx_printf(__VA_ARGS__)