Use lower-case header filenames for MinGW cross-compilation

testApp/remote/testGetPerformance.cpp

@@ -17,7 +17,7 @@
 #include <stdlib.h>
 
 #ifdef _WIN32
-#include <WinSock2.h>
+#include <winsock2.h>
 #else
 #include <sys/time.h>
 #endif

testApp/remote/testMonitorPerformance.cpp

@@ -17,7 +17,7 @@
 #include <stdlib.h>
 
 #ifdef _WIN32
-#include <WinSock2.h>
+#include <winsock2.h>
 #else
 #include <sys/time.h>
 #endif

testApp/utils/testInetAddressUtils.cpp

@@ -217,7 +217,7 @@ void test_getLoopbackNIF()
 
 #ifdef _WIN32
 // needed for ip_mreq
-#include <Ws2tcpip.h>
+#include <ws2tcpip.h>
 #endif
 
 void test_multicastLoopback()