Add target_link_libraries for cc_library

It will fix #2728.

Maybe it is silly to `target_link_libraries` for static library,
because a static library do not need to link other libraries. But
it will tell cmake how to propagate dependencies.

The solution comes from
[here](http://floooh.github.io/2016/01/12/cmake-dependency-juggling.html).

* Also change op_proto_test DEPS for testing this fix works.

cmake/generic.cmake

@@ -162,6 +162,7 @@ function(cc_library TARGET_NAME)
     endif()
     if (cc_library_DEPS)
       add_dependencies(${TARGET_NAME} ${cc_library_DEPS})
+      target_link_libraries(${TARGET_NAME} ${cc_library_DEPS})
     endif()
   else(cc_library_SRCS)
     if (cc_library_DEPS)
@@ -211,6 +212,7 @@ function(nv_library TARGET_NAME)
       endif()
       if (nv_library_DEPS)
         add_dependencies(${TARGET_NAME} ${nv_library_DEPS})
+        target_link_libraries(${TARGET_NAME} ${nv_library_DEPS})
       endif()
     else(nv_library_SRCS)
       if (nv_library_DEPS)

paddle/framework/CMakeLists.txt

@@ -7,4 +7,4 @@ cc_test(scope_test SRCS scope_test.cc)
 cc_test(enforce_test SRCS enforce_test.cc)
 proto_library(attr_type SRCS attr_type.proto)
 proto_library(op_proto SRCS op_proto.proto DEPS attr_type)
-cc_test(op_proto_test SRCS op_proto_test.cc DEPS op_proto attr_type protobuf)
+cc_test(op_proto_test SRCS op_proto_test.cc DEPS op_proto protobuf)