Remove %elif no which is unsupported on RHEL8

Author: kwk

llvm.spec

@@ -976,9 +976,11 @@ popd
 
 %if %{with snapshot_build}
 	%global cmake_config_args %{cmake_config_args} -DLLVM_VERSION_SUFFIX="%{llvm_snapshot_version_suffix}"
-%elif %{without compat_build}
+%else
+%if %{without compat_build}
 	%global cmake_config_args %{cmake_config_args} -DLLVM_VERSION_SUFFIX=''
 %endif
+%endif
 
 %ifarch x86_64
 	%global cmake_config_args %{cmake_config_args} -DCMAKE_SHARED_LINKER_FLAGS="$LDFLAGS -Wl,-z,cet-report=error"