cmake: Address Missing Winsock Library w/ MinGW

Addresses #268

Author: pmcgaugh

CMakeLists.txt

@@ -144,6 +144,10 @@ if (MHD_VERSION_STRING VERSION_LESS "0.9.53")
     set(WITH_WEBSOCKET OFF)
 endif ()
 
+if(WIN32 AND MINGW)
+    LIST(APPEND ULFIUS_LIBS ws2_32)
+endif()
+
 if (WITH_WEBSOCKET)
     set(U_DISABLE_WEBSOCKET OFF)
     find_package(ZLIB REQUIRED)