removed some compiler warnings that indicate potential undefined behaviour

src/core1/code_660.c

@@ -104,7 +104,7 @@ static int _rarezip_uncompress(u8 **srcPtr, u8 **dstPtr, struct huft * arg2){
     int result;
     result = _rarezip_inflate(*srcPtr, *dstPtr, arg2);
     *dstPtr = *dstPtr + D_8027BF1C;
-    *dstPtr = ((u32)*dstPtr & 0xF) ? ((u32)*dstPtr & -0x10) + 0x10: *dstPtr;
+    *dstPtr = ((u32)*dstPtr & 0xF) ? (u8 *) ((u32)*dstPtr & -0x10) + 0x10: *dstPtr;
     *srcPtr = *srcPtr + D_8027BF18 + COMP_HEADER_SIZE;
     return result;
 }

src/core1/code_8C50.c

@@ -484,7 +484,11 @@ void func_80247560(void){
     D_80280684 = 0;
     D_80280680 = 0;
     tmp_v0 = D_8027EF40;
-    while((u32)tmp_v0 % 0x10){((u32)tmp_v0)++;}
+
+    while ((u32) tmp_v0 % 0x10) {
+        tmp_v0 = (u64 *) ((u32) tmp_v0 + 1);
+    }
+
     D_80275950.t.yield_data_ptr = tmp_v0;
     osCreateThread(&D_80280428, 5, func_802473B4, NULL, &D_8027FC28[2048], 60);
     osStartThread(&D_80280428);

src/core1/memory.c

@@ -139,8 +139,8 @@ void memcpy(void * dst, void *src, int size){
     while(size > 0){
         *(u8*)dst = *(u8*)src;
         size--;
-        ((u8*)dst)++;
-        ((u8*)src)++;
+        dst = (u8 *) dst + 1;
+        src = (u8 *) src + 1;
     }
 }
 
@@ -148,8 +148,8 @@ void wmemcpy(void * dst, void *src, int size){
     while(size > 0){
         *(u32*)dst = *(u32*)src;
         size -= 4;
-        ((u32*)dst)++;
-        ((u32*)src)++;
+        dst = (u32 *) dst + 1;
+        src = (u32 *) src + 1;
     }
 }