Remove prompt to exit in all programs

Signed-off-by: José Simões <jose.simoes@eclo.solutions>

programs/ssl/ssl_pthread_server.c

@@ -515,11 +515,6 @@ exit:
     mbedtls_memory_buffer_alloc_free();
 #endif
 
-#if defined(_WIN32)
-    mbedtls_printf( "  Press Enter to exit this program.\n" );
-    fflush( stdout ); getchar();
-#endif
-
     mbedtls_exit( ret );
 }