Обсуждение: pgsql: Clean up buildfarm failures arising from the seemingly

Log Message:
-----------
Clean up buildfarm failures arising from the seemingly straightforward page
macros patch :-(.  Results from both baiji and mastodon imply that MSVC
fails to perceive offsetof(PageHeaderData, pd_linp[0]) as a constant
expression in some contexts where offsetof(PageHeaderData, pd_linp) works
fine.  Sloth, thy name is Micro.

Modified Files:
--------------
    pgsql/src/include/storage:
        bufpage.h (r1.82 -> r1.83)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/storage/bufpage.h?r1=1.82&r2=1.83)