nghttp2: Update build within CMake to account for 1.50.0
diff --git a/Utilities/cmnghttp2/CMakeLists.txt b/Utilities/cmnghttp2/CMakeLists.txt
index 9002ab6..6d0c76f 100644
--- a/Utilities/cmnghttp2/CMakeLists.txt
+++ b/Utilities/cmnghttp2/CMakeLists.txt
@@ -19,6 +19,7 @@
   lib/nghttp2_buf.c
   lib/nghttp2_callbacks.c
   lib/nghttp2_debug.c
+  lib/nghttp2_extpri.c
   lib/nghttp2_frame.c
   lib/nghttp2_hd.c
   lib/nghttp2_hd_huffman.c