package/freeradius-server: fix python build

Fix the following build failure raised since bump to version 3.2.3 in
commit 4155139365247ea702bb536848dd1e771f98f0d2:

In file included from /home/thomas/autobuild/instance-1/output-1/host/include/python3.11/Python.h:38,
                 from src/modules/rlm_python3/rlm_python3.c:37:
/home/thomas/autobuild/instance-1/output-1/host/include/python3.11/pyport.h:596:2: error: #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
  596 | #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
      |  ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/36143ab06b66a047aa2247ea66b1df0d6c1cbd66

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/freeradius-server/freeradius-server.mk

@@ -149,7 +149,9 @@ FREERADIUS_SERVER_CONF_OPTS += --without-pcre
 endif
 
 ifeq ($(BR2_PACKAGE_PYTHON3),y)
-FREERADIUS_SERVER_CONF_OPTS += --with-rlm_python3
+FREERADIUS_SERVER_CONF_OPTS += \
+	--with-rlm_python3 \
+	--with-rlm-python3-config-bin=$(STAGING_DIR)/usr/bin/python3-config
 FREERADIUS_SERVER_DEPENDENCIES += python3
 else
 FREERADIUS_SERVER_CONF_OPTS += --without-rlm_python3