K 10
svn:author
V 6
pkubaj
K 8
svn:date
V 27
2020-10-27T14:23:42.300134Z
K 7
svn:log
V 677
audio/ardour6: fix build on GCC architectures

Undefine _POSIX_SOURCE to make macros in errno.h available:
/usr/local/lib/gcc9/include/c++/powerpc64-portbld-freebsd12.1/bits/error_constants.h:42:40: error: 'EAFNOSUPPORT' was not declared in this scope
   42 |       address_family_not_supported =   EAFNOSUPPORT,
      |                                        ^~~~~~~~~~~~
/usr/local/lib/gcc9/include/c++/powerpc64-portbld-freebsd12.1/bits/error_constants.h:43:28: error: 'EADDRINUSE' was not declared in this scope
   43 |       address_in_use =     EADDRINUSE,
      |                            ^~~~~~~~~~

Also tested to build with Clang.

MFH:		2020Q4 (fix build blanket)

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