fix MSVC compilation errors

After commit 3701d499 'error_resilience: remove avpriv_atomic usage'
we have included windows.h in much more files and we should
avoid conflicts with defines/function declarations.
Signed-off-by: Mateusz Brzostek <mateuszb@poczta.onet.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/jpegls.h

@@ -32,6 +32,8 @@
 #include "avcodec.h"
 #include "internal.h"
 
+#undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
+
 typedef struct JpeglsContext {
     AVCodecContext *avctx;
 } JpeglsContext;

libavcodec/mjpegdec.h

@@ -39,6 +39,8 @@
 #include "hpeldsp.h"
 #include "idctdsp.h"
 
+#undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
+
 #define MAX_COMPONENTS 4
 
 typedef struct MJpegDecodeContext {

libavcodec/mss2.c

@@ -464,9 +464,9 @@ static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size,
     return 0;
 }
 
-typedef struct Rectangle {
+struct Rectangle {
     int coded, x, y, w, h;
-} Rectangle;
+};
 
 #define MAX_WMV9_RECTANGLES 20
 #define ARITH2_PADDING 2
@@ -485,7 +485,7 @@ static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 
     int keyframe, has_wmv9, has_mv, is_rle, is_555, ret;
 
-    Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
+    struct Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r;
     int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask);
 
     if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)