Reapply "postgresql: update to version 16.3"

[dangowrt]

Maintainer: me
Compile tested: aarch64/cortex-a53
Run tested: -

Description:
This reverts commit 3dbefd2. openwrt/openwrt@72accd078f fixes the actual issue of 'flex' not working unless the M4 environment variable is set, which isn't done in case of building with CMake or Meson.

I'm going to follow up and update PostgreSQL to 16.4 for the upcoming openwrt-24.10 branch, and then to PostgreSQL 17.0 in the development branch.

[hnyman]

Well, I have not specific knowledge, but CI seems to dislike your changes.

 [234/1612] Generating src/fe_utils/psqlscan with a custom command
FAILED: src/fe_utils/psqlscan.c 
/builder/staging_dir/host/bin/python3 ../src/tools/pgflex --builddir . --srcdir .. --privatedir src/fe_utils/psqlscan.c.p --flex /builder/staging_dir/host/bin/flex --perl /builder/staging_dir/host/bin/perl -i ../src/fe_utils/psqlscan.l -o src/fe_utils/psqlscan.c --no-backup --fix-warnings -- -Cfe -p -p
flex: fatal internal error, exec of /builder/shared-workdir/build/staging_dir/host/bin/m4 failed
[235/1612] Compiling C object src/interfaces/libpq/libpq.so.5.16.p/libpq-events.c.o
[236/1612] Compiling C object src/interfaces/libpq/libpq.so.5.16.p/pqexpbuffer.c.o
[237/1612] Compiling C object src/interfaces/libpq/libpq.so.5.16.p/fe-connect.c.o
ninja: build stopped: subcommand failed.
make[2]: *** [Makefile:264: /builder/build_dir/target-mips_24kc_musl/postgresql-16.3/.built] Error 1
make[2]: Leaving directory '/feed/libs/postgresql'
time: package/feeds/packages_ci/postgresql/compile#41.27#17.80#32.34
    ERROR: package/feeds/packages_ci/postgresql failed to build.

[dangowrt]

@hnyman This looks like openwrt/openwrt@72accd078f has not yet been applied to the container used for CI. How can we know which commit level the SDK used in the container is on?

[hnyman]

You should rebase the PR branch once the SDK has surely been rebuilt in images phase1 buildbot, so that the new CI round gets triggered.