msvc: Fix compilation errors due to header include order.

Ensures that the header include order is such that winsock2.h is always
included before windows.h or that windows.h does not include winsock.h.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavdevice/dshow_capture.h

@@ -27,6 +27,7 @@
 #include "avdevice.h"
 
 #define COBJMACROS
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #define NO_DSHOW_STRSAFE
 #include <dshow.h>

libavdevice/opengl_enc.c

@@ -31,6 +31,7 @@
 #include "config.h"
 
 #if HAVE_WINDOWS_H
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #endif
 #if HAVE_OPENGL_GL3_H

libavformat/matroskadec.c

@@ -32,12 +32,6 @@
 
 #include <inttypes.h>
 #include <stdio.h>
-#if CONFIG_BZLIB
-#include <bzlib.h>
-#endif
-#if CONFIG_ZLIB
-#include <zlib.h>
-#endif
 
 #include "libavutil/avstring.h"
 #include "libavutil/base64.h"
@@ -62,6 +56,13 @@
 #include "riff.h"
 #include "rmsipr.h"
 
+#if CONFIG_BZLIB
+#include <bzlib.h>
+#endif
+#if CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
 typedef enum {
     EBML_NONE,
     EBML_UINT,

libavutil/atomic_win32.h

@@ -21,6 +21,7 @@
 #ifndef AVUTIL_ATOMIC_WIN32_H
 #define AVUTIL_ATOMIC_WIN32_H
 
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
 #define avpriv_atomic_int_get atomic_int_get_win32