libavutil: drop fallback definitions of INTxx_MIN/MAX

This list is incomplete (we also use UINT16_MAX), so there does
not appear to be any system we care about that needs these.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavutil/internal.h

@@ -52,38 +52,6 @@ struct AVDictionary {
 #endif
 #endif
 
-#ifndef INT16_MIN
-#define INT16_MIN       (-0x7fff - 1)
-#endif
-
-#ifndef INT16_MAX
-#define INT16_MAX       0x7fff
-#endif
-
-#ifndef INT32_MIN
-#define INT32_MIN       (-0x7fffffff - 1)
-#endif
-
-#ifndef INT32_MAX
-#define INT32_MAX       0x7fffffff
-#endif
-
-#ifndef UINT32_MAX
-#define UINT32_MAX      0xffffffff
-#endif
-
-#ifndef INT64_MIN
-#define INT64_MIN       (-0x7fffffffffffffffLL - 1)
-#endif
-
-#ifndef INT64_MAX
-#define INT64_MAX INT64_C(9223372036854775807)
-#endif
-
-#ifndef UINT64_MAX
-#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
-#endif
-
 #ifndef INT_BIT
 #    define INT_BIT (CHAR_BIT * sizeof(int))
 #endif