dlopen issues on Almalinux9

[Bill Campbell]

I'm trying to build freeradius from the git version 4.0.0 on Almalinux9,
but having problems with failures building the included dlopen.c.

Building under the OpenPKG package management system.

# uname -a
Linux almadev9.mi.celestial.com 5.14.0-70.13.1.el9_0.x86_64 #1 SMP PREEMPT Tue May 17 15:53:11 EDT 2022 x86_64 x86_64 x86_64 GNU/Linux

gcc-11.2.0
binutils-2.38
automake-1.16.5
autoconf-2.71
libtool-2.4.6

The compile is failing with __GLIBC_USE and __GNUC_PREREQ errors.

The configure script finds the system's -ldl, but I haven't been
able to figure out how to use that instead of the included dlopen.

I've had similar results trying to build on the latest versions
of 64-bit Raspberry Pi Linux.

Bill
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