Replace hokey "hooks" struct with weak symbol annotations

- Did a test build to ensure RA built
- Copied over to my FTPservU sources and ensured no compile issues there

Looks solid. A lot cleaner, too.

@aliaspider

frontend/drivers/platform_wiiu.c

@@ -49,7 +49,6 @@
 #include "../../retroarch.h"
 #include "../../gfx/video_driver.h"
 
-#include "wiiu_main.h"
 #include "hbl.h"
 #include "wiiu_dbg.h"
 #include "system/exception_handler.h"
@@ -68,10 +67,6 @@
  * The Wii U frontend driver, along with the main() method.
  */
 
-/* TODO: If we want greater control over which filesystems get mounted,
- * implement callbacks and assign them below. */
-hooks_t hooks = { NULL, NULL };
-
 static enum frontend_fork wiiu_fork_mode = FRONTEND_FORK_NONE;
 static const char *elf_path_cst = WIIU_SD_PATH "retroarch/retroarch.elf";
 

wiiu/main.c

@@ -188,36 +188,36 @@ static void try_shutdown_iosuhax(void)
   iosuhaxMount = false;
 }
 
+__attribute__((weak))
+void mount_filesystems(void)
+{
+   if(iosuhaxMount)
+      fatInitDefault();
+   else
+      mount_sd_fat("sd");
+}
+
+__attribute__((weak))
+void unmount_filesystems(void)
+{
+  if (iosuhaxMount)
+  {
+    fatUnmount("sd:");
+    fatUnmount("usb:");
+  }
+  else
+    unmount_sd_fat("sd");
+}
+
 static void fsdev_init(void)
 {
    iosuhaxMount = try_init_iosuhax();
 
-   if(hooks.fs_mount != NULL && hooks.fs_unmount != NULL)
-     hooks.fs_mount();
-   else
-   {
-     if(iosuhaxMount)
-       fatInitDefault();
-     else
-       mount_sd_fat("sd");
-   }
+   mount_filesystems();
 }
 
 static void fsdev_exit(void)
 {
-   if(hooks.fs_mount != NULL && hooks.fs_unmount != NULL)
-
-     hooks.fs_unmount();
-   else
-   {
-      if (iosuhaxMount)
-      {
-         fatUnmount("sd:");
-         fatUnmount("usb:");
-      }
-      else
-         unmount_sd_fat("sd");
-   }
-
+   unmount_filesystems();
    try_shutdown_iosuhax();
 }

wiiu/wiiu_main.h

@@ -3,14 +3,8 @@
 
 #include "wiiu/types.h"
 
-struct main_hooks {
-  void (*fs_mount)(void);
-  void (*fs_unmount)(void);
-};
-
-typedef struct main_hooks hooks_t;
-
-extern hooks_t hooks;
+void mount_filesystems(void);
+void unmount_filesystems(void);
 extern bool iosuhaxMount;
 
 #endif /* _MAIN_H */