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Our json parsing defined the macros OPTIONAL and REQUIRED to decorate the
structs with for increased readability. This however collides with macros
in the <windef.h> header on Windows.
../src/interfaces/libpq/fe-auth-oauth-curl.c:398:9: warning: "OPTIONAL" redefined
398 | #define OPTIONAL false
| ^~~~~~~~
In file included from D:/a/_temp/msys64/ucrt64/include/windef.h:9,
from D:/a/_temp/msys64/ucrt64/include/windows.h:69,
from D:/a/_temp/msys64/ucrt64/include/winsock2.h:23,
from ../src/include/port/win32_port.h:60,
from ../src/include/port.h:24,
from ../src/include/c.h:1331,
from ../src/include/postgres_fe.h:28,
from ../src/interfaces/libpq/fe-auth-oauth-curl.c:16:
include/minwindef.h:65:9: note: this is the location of the previous definition
65 | #define OPTIONAL
| ^~~~~~~~
Rename to avoid compilation errors in anticipation of implementing
support for Windows.
Reported-by: Dave Cramer (on PostgreSQL Hacking Discord)