macos ventura SDK spews warnings

Hi

I had recently updated the M1 mini that I use to test macOS stuff on. Just
tried to test a change on it and was greeted with a lot of
warnings. Apparently the update brought in a newer SDK (MacOSX13.0.sdk), even
though the OS is still Monterey.

One class of warnings is specific to meson (see further down), but the other
is common between autoconf and meson:

[24/2258] Compiling C object src/port/libpgport_srv.a.p/snprintf.c.o
../../../src/postgres/src/port/snprintf.c:1002:11: warning: 'sprintf' is deprecated: This function is provided for compatibility reasons only. Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Wdeprecated-declarations]
vallen = sprintf(convert, "%p", value);
^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.0.sdk/usr/include/stdio.h:188:1: note: 'sprintf' has been explicitly marked deprecated here
__deprecated_msg("This function is provided for compatibility reasons only. Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead.")
^
/Library/Developer/CommandLineTools/SDKs/MacOSX13.0.sdk/usr/include/sys/cdefs.h:215:48: note: expanded from macro '__deprecated_msg'
#define __deprecated_msg(_msg) __attribute__((__deprecated__(_msg)))
^

the same warning is repeated for a bunch of different lines in the same file,
and then over the three versions of libpgport that we build.

This is pretty noisy.

The meson specific warning is
[972/1027] Linking target src/backend/replication/libpqwalreceiver/libpqwalreceiver.dylib
ld: warning: -undefined dynamic_lookup may not work with chained fixups

Which is caused by meson defaulting to -Wl,-undefined,dynamic_lookup for
modules. But we don't need that because we use -bund-loader. Adding
-Wl,-undefined,error as in the attached fixes it.

Greetings,

Andres Freund