FindMagnum.cmake: NaCl application has also dependencies.

Although these are needed only with static build.

modules/FindMagnum.cmake

@@ -185,7 +185,10 @@ foreach(component ${Magnum_FIND_COMPONENTS})
             endif()
         endif()
 
-        # NaCl application has no additional dependencies
+        # NaCl application dependencies
+        if(${component} STREQUAL NaClApplication)
+            set(_MAGNUM_${_COMPONENT}_LIBRARIES ppapi_cpp ppapi ${_WINDOWCONTEXT_MAGNUM_LIBRARIES_DEPENDENCY})
+        endif()
 
         # GLX application dependencies
         if(${component} STREQUAL GlxApplication)