hevcdsp: add missing header include

Fixes make checkheaders

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/hevcdsp.h

@@ -25,6 +25,8 @@
 #ifndef AVCODEC_X86_HEVCDSP_H
 #define AVCODEC_X86_HEVCDSP_H
 
+#include <stdint.h>
+
 #define PEL_LINK(dst, idx1, idx2, idx3, name, D, opt) \
 dst[idx1][idx2][idx3] = ff_hevc_put_hevc_ ## name ## _ ## D ## _##opt; \
 dst ## _bi[idx1][idx2][idx3] = ff_hevc_put_hevc_bi_ ## name ## _ ## D ## _##opt; \