actually fix assembler bug, make sure it compiles.

include/functions.h

@@ -20,6 +20,8 @@ s32 func_800555E4(s32);
 void func_80137D88(s32, f32);
 void func_80137E10(s32, u8, u8, u8);
 s32 rand_int(s32);
+void sort_items(void);
+s32 is_ability_active(s32 arg0);
 
 s32 play_sound_at_position(s32 soundID, s32 value2, f32 posX, f32 posY, f32 posZ);
 s32 set_music_track(s32 musicPlayer, s32 songID, s32 variation, s32 unk, s32 volume);

papermario.ld

@@ -897,7 +897,7 @@ SECTIONS
       build/bin/papermario.090FE0.bin_90fe0_len_14df0.o(.data);
    }
 
-   // uncomment once rodata for is_ability_active is needed.
+   /* uncomment once rodata for is_ability_active is needed. */
    /*.rodata8010BF60 0x8010BF60 : AT(0xA5410) {
       build/src/code_80850_len_3060.o(.rodata)
    }

src/code_80850_len_3060.c

@@ -1,8 +1,5 @@
 #include "common.h"
 
-void sort_items(void);
-s32 is_ability_active(s32 arg0);
-
 void clear_player_data(void) {
     player_data* playerData = &gPlayerData;
     s32 i;
@@ -719,7 +716,7 @@ void reset_status_menu(void) {
 }
 
 // uses a jumptable, which we need .rodata support for.
-INCLUDE_ASM(code_80850_len_3060, is_ability_active);
+s32 INCLUDE_ASM(code_80850_len_3060, is_ability_active, s32 arg0);
 // Somewhat close. Needs work.
 /*s32 is_ability_active(s32 arg0) {
     s32 iVar2;