lavu/opt: consolidate common prologue for av_opt_set*()

The options-setting functions share several operations at their
beginnings - locating the option and the object to operate on, handling
the read-only and deprecated flags, and constructing the pointer to the
target value. Some of the functions also do not perform some of the
checks, although they should. E.g. a deprecation warning is currently
only printed for av_opt_set().

Introduce a prologue function that is called from every av_opt_set*()
and performs all these common initialization operations.

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