decomp: rewrite 4 countdown-then-unregister wrappers

Shape:
    void f(char *obj) {
        char *p = *(char **)(obj + 4);
        int val = *(int *)(p + CTR_OFF) -
                  *(int *)(*(char **)obj + DELTA_OFF);
        *(int *)(p + CTR_OFF) = val;
        if (val > 0) return;
        *(char *)(*(int *)p + 0x1c7) = 4;
        func_0203c634(obj, *(signed char *)(obj + 0x20), 0);
    }

Counterpart of the earlier accumulator dispatchers, but this variant
counts DOWN (subtracts a delta each tick) and only fires the tag +
unregister when the counter hits zero-or-negative. Uses LDMGTIA
(return if signed >) as the early exit. Byte-parity verified for
ov219_020d0b9c. Modules 269/37 unchanged.

Author: Yokimitsuro

src/overlays/ov219/asm_stubs/calls/func_ov219_020d0b9c.c

@@ -0,0 +1,10 @@
+extern void func_0203c634(void *obj, int idx, void *value);
+
+void func_ov219_020d0b9c(char *obj) {
+    char *p = *(char **)(obj + 4);
+    int val = *(int *)(p + 0x14) - *(int *)(*(char **)obj + 0x2c);
+    *(int *)(p + 0x14) = val;
+    if (val > 0) return;
+    *(char *)(*(int *)p + 0x1c7) = 4;
+    func_0203c634(obj, *(signed char *)(obj + 0x20), 0);
+}

src/overlays/ov219/calls/func_ov219_020d0b9c.c

@@ -0,0 +1,10 @@
+extern void func_0203c634(void *obj, int idx, void *value);
+
+void func_ov220_020d2a28(char *obj) {
+    char *p = *(char **)(obj + 4);
+    int val = *(int *)(p + 0x14) - *(int *)(*(char **)obj + 0x2c);
+    *(int *)(p + 0x14) = val;
+    if (val > 0) return;
+    *(char *)(*(int *)p + 0x1c7) = 4;
+    func_0203c634(obj, *(signed char *)(obj + 0x20), 0);
+}

src/overlays/ov220/asm_stubs/calls/func_ov220_020d2a28.c

@@ -0,0 +1,10 @@
+extern void func_0203c634(void *obj, int idx, void *value);
+
+void func_ov239_020ccf90(char *obj) {
+    char *p = *(char **)(obj + 4);
+    int val = *(int *)(p + 0x2c) - *(int *)(*(char **)obj + 0x2c);
+    *(int *)(p + 0x2c) = val;
+    if (val > 0) return;
+    *(char *)(*(int *)p + 0x1c7) = 4;
+    func_0203c634(obj, *(signed char *)(obj + 0x20), 0);
+}

src/overlays/ov220/calls/func_ov220_020d2a28.c

@@ -0,0 +1,10 @@
+extern void func_0203c634(void *obj, int idx, void *value);
+
+void func_ov240_020cee40(char *obj) {
+    char *p = *(char **)(obj + 4);
+    int val = *(int *)(p + 0x38) - *(int *)(*(char **)obj + 0x2c);
+    *(int *)(p + 0x38) = val;
+    if (val > 0) return;
+    *(char *)(*(int *)p + 0x1c7) = 4;
+    func_0203c634(obj, *(signed char *)(obj + 0x20), 0);
+}