Fix MinGW compilation errors in jerry-ext (#4510)

MinGW also needs linking to ws2_32.
Defining socket types for unix/win32 for compatibility.
Also fixes #4512

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

jerry-ext/CMakeLists.txt

@@ -62,7 +62,7 @@ target_link_libraries(${JERRY_EXT_NAME} jerry-core)
 
 set(JERRY_EXT_PKGCONFIG_LIBS)
 
-if(USING_MSVC AND JERRY_DEBUGGER)
+if("${PLATFORM}" STREQUAL "WINDOWS" AND JERRY_DEBUGGER)
   target_link_libraries(${JERRY_EXT_NAME} ws2_32)
   set(JERRY_EXT_PKGCONFIG_LIBS -lws2_32)
 endif()