vlc_fixups: define INET6_ADDRSTRLEN on OS/2

This fixes a compilation error on OS/2:

  CC       stream_out/udp.lo
stream_out/udp.c: In function 'CreateSDP':
stream_out/udp.c:89:16: error: 'INET6_ADDRSTRLEN' undeclared (first use in this function); did you mean 'INET_ADDRSTRLEN'?
   89 |     char dhost[INET6_ADDRSTRLEN];
      |                ^~~~~~~~~~~~~~~~
      |                INET_ADDRSTRLEN
stream_out/udp.c:89:16: note: each undeclared identifier is reported only once for each function it appears in
stream_out/udp.c:89:10: warning: unused variable 'dhost' [-Wunused-variable]
   89 |     char dhost[INET6_ADDRSTRLEN];
      |          ^~~~~

added 2 commits

• 889cf5c2 - 1 commit from branch videolan:master
• 00baeea4 - vlc_fixups: define INET6_ADDRSTRLEN on OS/2

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approved this merge request

The fix is correct, although I wonder if we should just not compile IPv6 code if the platform doesn't support it, rather than fake pretend it does support it.

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added 36 commits

• 00baeea4...38ff12ee - 35 commits from branch videolan:master
• 3431ed42 - vlc_fixups: define INET6_ADDRSTRLEN on OS/2

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