freeradius: add -latomic for armv5

freeradius fails to build for armv5:

| *** Warning: Linking the executable build/bin/local/radeapclient against the loadable module
| *** libfreeradius-server.so is not portable!
|
| *** Warning: Linking the executable build/bin/local/radeapclient against the loadable module
| *** libfreeradius-eap.so is not portable!
path -Wl,/yow-lpggp31/tgamblin/freeradius.build/tmp-glibc/work/armv5e-oe-linux-gnueabi/freeradius/3.0.19-r0/git/build/lib/local//.libs
/arm-oe-linux-gnueabi/9.2.0/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined reference to `__atomic_compare_exchange_8'
/arm-oe-linux-gnueabi/9.2.0/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined reference to `__atomic_load_8'
/arm-oe-linux-gnueabi/9.2.0/ld: build/lib/local/.libs/libfreeradius-radius.so: undefined reference to `__atomic_store_8'
| collect2: error: ld returned 1 exit status
| scripts/boiler.mk:630: recipe for target 'build/bin/local/radeapclient' failed

Explicitly link libatomic to fix the issue.

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-connectivity/freeradius/freeradius_3.0.19.bb

@@ -38,6 +38,7 @@ S = "${WORKDIR}/git"
 
 LDFLAGS_append_powerpc = " -latomic"
 LDFLAGS_append_mipsarch = " -latomic"
+LDFLAGS_append_armv5 = " -latomic"
 
 EXTRA_OECONF = " --enable-strict-dependencies \
         --with-docdir=${docdir}/freeradius-${PV} \