use SDL's functions version inplace of libc version

src/power/haiku/SDL_syspower.c

@@ -59,7 +59,7 @@ SDL_GetPowerInfo_Haiku(SDL_PowerState * state, int *seconds, int *percent)
         return SDL_FALSE;       /* maybe some other method will work? */
     }
 
-    memset(regs, '\0', sizeof(regs));
+    SDL_memset(regs, '\0', sizeof(regs));
     regs[0] = APM_FUNC_OFFSET + APM_FUNC_GET_POWER_STATUS;
     regs[1] = APM_DEVICE_ALL;
     rc = ioctl(fd, APM_BIOS_CALL, regs);

src/power/linux/SDL_syspower.c

@@ -51,7 +51,7 @@ open_power_file(const char *base, const char *node, const char *key)
         return -1;  /* oh well. */
     }
 
-    snprintf(path, pathlen, "%s/%s/%s", base, node, key);
+    SDL_snprintf(path, pathlen, "%s/%s/%s", base, node, key);
     fd = open(path, O_RDONLY | O_CLOEXEC);
     SDL_stack_free(path);
     return fd;