OCppunitTest_sc_opencl_test: only depend on scopencl if ENABLE_OPENCL.

scopencl is only built when ENABLE_OPENCL is true, but the unit test
should still run successfully using the fallback mechanism without
scopencl (i.e. when --disable-opencl is used).

Change-Id: I4b44148f1f59ad8b3d9c78c2fd0e1cbe2030db37

sc/CppunitTest_sc_opencl_test.mk

@@ -37,7 +37,7 @@ $(eval $(call gb_CppunitTest_use_libraries,sc_opencl_test, \
     salhelper \
     sax \
     sc \
-    scopencl \
+    $(if $(ENABLE_OPENCL),scopencl) \
     scqahelper \
     sfx \
     sot \