avutil: Add deprecation ifdefs around obsolete intfloat code

This long-deprecated code should disappear at the next version bump.

libavutil/intfloat_readwrite.c

@@ -28,7 +28,9 @@
 #include <stdint.h>
 #include "mathematics.h"
 #include "intfloat_readwrite.h"
+#include "version.h"
 
+#if FF_API_INTFLOAT
 double av_int2dbl(int64_t v){
     if((uint64_t)v+v > 0xFFEULL<<52)
         return NAN;
@@ -95,3 +97,4 @@ AVExtFloat av_dbl2ext(double d){
         ext.exponent[0] |= 0x80;
     return ext;
 }
+#endif /* FF_API_INTFLOAT */

libavutil/intfloat_readwrite.h

@@ -22,8 +22,11 @@
 #define AVUTIL_INTFLOAT_READWRITE_H
 
 #include <stdint.h>
+
 #include "attributes.h"
+#include "version.h"
 
+#if FF_API_INTFLOAT
 /* IEEE 80 bits extended float */
 typedef struct AVExtFloat  {
     uint8_t exponent[2];
@@ -36,5 +39,6 @@ attribute_deprecated double av_ext2dbl(const AVExtFloat ext) av_const;
 attribute_deprecated int64_t av_dbl2int(double d) av_const;
 attribute_deprecated int32_t av_flt2int(float d) av_const;
 attribute_deprecated AVExtFloat av_dbl2ext(double d) av_const;
+#endif /* FF_API_INTFLOAT */
 
 #endif /* AVUTIL_INTFLOAT_READWRITE_H */

libavutil/version.h

@@ -91,6 +91,9 @@
 #ifndef FF_API_XVMC
 #define FF_API_XVMC                     (LIBAVUTIL_VERSION_MAJOR < 53)
 #endif
+#ifndef FF_API_INTFLOAT
+#define FF_API_INTFLOAT                 (LIBAVUTIL_VERSION_MAJOR < 53)
+#endif
 
 /**
  * @}