Remove URL_HASH check for x264 lib

Change-Id: I45a98a1f3108397c31389901284967e1611d61f8
Signed-off-by: Éanna Ó Catháin <eanna.ocathain@arm.com>
diff --git a/samples/ObjectDetection/cmake/find_opencv.cmake b/samples/ObjectDetection/cmake/find_opencv.cmake
index 4d26953..92086e1 100644
--- a/samples/ObjectDetection/cmake/find_opencv.cmake
+++ b/samples/ObjectDetection/cmake/find_opencv.cmake
@@ -61,7 +61,6 @@
 
         ExternalProject_Add(${X264_LIB}
             URL "https://code.videolan.org/videolan/x264/-/archive/${LIBX264_VERSION}/x264-${LIBX264_VERSION}.tar.gz"
-            URL_HASH MD5=07eae2352f6ba201999be45fece0c26c
             DOWNLOAD_DIR ${LIBX264_ROOT_DIR}
             PREFIX ${LIBX264_ROOT_DIR}
             CONFIGURE_COMMAND <SOURCE_DIR>/configure