enet: Search for shared library

CMakeLists.txt

@@ -536,9 +536,14 @@ include_directories(Source/Core)
 add_subdirectory(Externals/Bochs_disasm)
 include_directories(Externals/Bochs_disasm)
 
-if(NOT ENET_FOUND)
+if(NOT APPLE AND NOT ANDROID)
+        check_lib(ENET enet enet/enet.h QUIET)
+endif()
+if (ENET_FOUND)
+        message("Using shared enet")
+else()
 	message("Using static enet from Externals")
-	include_directories(Externals)
+	include_directories(Externals/enet/include)
 	add_subdirectory(Externals/enet)
 endif()
 LIST(APPEND LIBS enet)