[MacPorts] #71842: legacy-support: include sys/stdio.h from stdio.h

[MacPorts]

#71842: legacy-support: include sys/stdio.h from stdio.h
--------------------------+----------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.10.5
 Keywords:                |       Port:  legacy-support
--------------------------+----------------------------
 Apple headers from 10.10+ include `sys/stdio.h` from `stdio.h`, which
 makes `renameat` available: https://github.com/alexey-lysiuk/macos-
 sdk/blob/69ddec41e6224afebd5f19bb24764305ac3e828a/MacOSX10.10.sdk/usr/include/stdio.h#L75

 `legacy-support` provides `renameat` in `sys/stdio.h`, however does not
 include that header from `stdio.h`: https://github.com/macports/macports-
 legacy-
 support/blob/f109400eccefe2f735bcd9a068dad7a53407d548/include/stdio.h

 Obviously, Apple header does not do that either when `sys/stdio.h` does
 not exist in the OS: https://github.com/alexey-lysiuk/macos-
 sdk/blob/0efb06490f664d335a4fdff9198df7d03e87deda/MacOSX10.8.sdk/usr/include/stdio.h
 (or any other SDK before that header appears).

 In result, we get failures when compiling software which expects
 `renameat` to be available via `stdio.h` (which should work in fact, as it
 seems, but fails with `legacy-support`.

 Examples: https://github.com/capnproto/capnproto/pull/2212
 https://github.com/leo-arch/clifm/issues/298

-- 
Ticket URL: <https://trac.macports.org/ticket/71842>
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