FIX: support shared type

cmake/generic.cmake

@@ -274,7 +274,11 @@ function(go_library TARGET_NAME)
   # Add dummy code to support `make target_name` under Terminal Command
   set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}_dummy.c)
   file(WRITE ${dummyfile} "const char * dummy = \"${dummyfile}\";")
-  add_library(${TARGET_NAME} STATIC ${dummyfile})
+  if (go_library_SHARED OR go_library_shared)
+    add_library(${TARGET_NAME} SHARED ${dummyfile})
+  else()
+    add_library(${TARGET_NAME} STATIC ${dummyfile})
+  endif()
   if(go_library_DEPS)
     add_dependencies(${TARGET_NAME} ${go_library_DEPS})
   endif(go_library_DEPS)