Remove #pragma from rigtestmcastrx.c

https://github.com/Hamlib/Hamlib/issues/695

tests/rigtestmcastrx.c

@@ -7,7 +7,8 @@
 #ifdef _WIN32
 #include <winsock2.h>
 #include <ws2tcpip.h>
-#pragma comment(lib, "Ws2_32.lib")
+//#pragma does not work on mingw
+//#pragma comment(lib, "Ws2_32.lib")
 #else
 #include <arpa/inet.h>
 #include <netinet/in.h>