Revert "avformat/rtpproto: fix strict aliasing violations with sockaddr"

It appears this breaks build with MSVC
until someone who has MSVC setup has time to investigate and
workaround/fix this, its better to revert so that build is not broken
Thats even more so as the original commit only fixed a hypothetical issue

This reverts commit e587a428d75d58e2e5a592efd7bff44e1d9294ee.
