Fix a small mistake.

cmake/generic.cmake

@@ -94,7 +94,7 @@ if(NOT APPLE AND NOT ANDROID)
     find_package(Threads REQUIRED)
     link_libraries(${CMAKE_THREAD_LIBS_INIT})
     set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_CXX_LINK_EXECUTABLE} -ldl -lrt")
-endif(NOT APPLE)
+endif(NOT APPLE AND NOT ANDROID)
 
 function(merge_static_libs TARGET_NAME)
   set(libs ${ARGN})