Fix SubGetImageByName for iOS versions with ImageLoaderMegaDylib #28
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See comex's comment here: #27 tl;dr of that is x18 isn't supposed to be used in userland. This caused some hooked function pointers to randomly be overwritten with 0x0, causing a crash. Most notably was the function AudioUnitRender in mediaserverd.
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Newer iOS versions with ImageLoaderMegaDylib segfault without this patch when you try to use SubGetImageByName because it actually has a "handle" that is not a memory address for shared cache images. This makes it use the correct function in dyld.