avcodec/dirac_dwt: Avoid conversions between function pointers and void*

Pointers to void can be converted to any pointer to incomplete or
object type and back; but they are nevertheless not completely generic
pointers: There is no provision in the C standard that guarantees their
convertibility with function pointers. C90 lacks a generic function
pointer, C99 made every function pointer a generic function pointer and
still disallows the convertibility with void *. Both GCC as well as
Clang warn about this when using -pedantic.

Therefore use unions to avoid these conversions.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

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