avutil/mips/intreadwrite: build fix for mips64r6 (instruction 'lwl' not supported)

Signed-off-by: Shivraj Patil <shivraj.patil@imgtec.com>
Reviewed-by: Nedeljko Babic <Nedeljko.Babic@imgtec.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/mips/intreadwrite.h

@@ -24,7 +24,7 @@
 #include <stdint.h>
 #include "config.h"
 
-#if ARCH_MIPS64 && HAVE_INLINE_ASM
+#if ARCH_MIPS64 && HAVE_INLINE_ASM && !HAVE_MIPS64R6
 
 #define AV_RN32 AV_RN32
 static av_always_inline uint32_t AV_RN32(const void *p)
@@ -41,6 +41,6 @@ static av_always_inline uint32_t AV_RN32(const void *p)
     return v;
 }
 
-#endif /* ARCH_MIPS64 && HAVE_INLINE_ASM */
+#endif /* ARCH_MIPS64 && HAVE_INLINE_ASM && !HAVE_MIPS64R6 */
 
 #endif /* AVUTIL_MIPS_INTREADWRITE_H */