Whenever we include windows.h, also define WIN32_LEAN_AND_MEAN

This reduces the number of symbols and code pulled in drastically

gst/glib-compat.c

@@ -38,6 +38,7 @@
 #include <sys/types.h>
 
 #ifdef G_OS_WIN32
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <io.h>
 #endif /* G_OS_WIN32 */

gst/gsttask.c

@@ -111,6 +111,7 @@ struct _GstTaskPrivate
 };
 
 #ifdef _MSC_VER
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
 struct _THREADNAME_INFO

libs/gst/net/gstptpclock.c

@@ -61,6 +61,7 @@
 #include <sys/wait.h>
 #endif
 #ifdef G_OS_WIN32
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #endif
 #include <sys/types.h>