Can not be compiled.

Version: Rocky linux 9.3
postgresql-14.10

When I maked the source code, failed.
`
[root@XVNCloudMES-IOTDB01 pg_cron-1.6.2]# make
/usr/bin/clang -Wno-ignored-attributes -fno-strict-aliasing -fwrapv -fexcess-precision=standard -Xclang -no-opaque-pointers -Wno-unused-command-line-argument -Wno-compound-token-split-by-macro -Wno-deprecated-non-prototype -O2 -std=c99 -Wall -Wextra -Werror -Wno-unused-parameter -Wno-implicit-fallthrough -Iinclude -I/usr/pgsql-14/include -I. -I./ -I/usr/pgsql-14/include/server -I/usr/pgsql-14/include/internal -D_GNU_SOURCE -I/usr/include/libxml2 -I/usr/include -flto=thin -emit-llvm -c -o src/entry.bc src/entry.c
error: unknown argument: '-no-opaque-pointers'
make: *** [/usr/pgsql-14/lib/pgxs/src/makefiles/../../src/Makefile.global:1084: src/entry.bc] Error 1
`

Reproduce the failure with make and inspect the compile command for src/entry.c, along with the PostgreSQL PGXS makefile path shown in the error. Determine why the build rejects -no-opaque-pointers on Rocky Linux 9.3 with PostgreSQL 14.10; done means the pg_cron source compiles successfully in that environment.

Written by the indexing model from the issue text.