Disable Ceph build unless enabled.

If Ceph is in the compile environment - but not explicitly enabled,
then the RPM build may fail (installed but unpackaged files).

Thus, we should explicitly disable the Ceph build in cmake when Ceph
is disabled in the RPM (and vice-versa).

packaging/rhel/xrootd.spec.in

@@ -366,11 +366,18 @@ export CXX=clang++
 
 mkdir build
 pushd build
+cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RelWithDebInfo \
 %if %{?_with_tests:1}%{!?_with_tests:0}
-cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RelWithDebInfo -DENABLE_TESTS=TRUE -DUSE_LIBC_SEMAPHORE=%{use_libc_semaphore} ../
+      -DENABLE_TESTS=TRUE \
 %else
-cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RelWithDebInfo -DUSE_LIBC_SEMAPHORE=%{use_libc_semaphore} ../
+      -DENABLE_TESTS=FALSE \
 %endif
+%if %{?_with_ceph:1}%{!?_with_ceph:0}
+      -DENABLE_CEPH=TRUE \
+%else
+      -DENABLE_CEPH=FALSE \
+%endif
+      -DUSE_LIBC_SEMAPHORE=%{use_libc_semaphore} ../
 
 make -i VERBOSE=1 %{?_smp_mflags}
 popd