- workaround for hexl's failure to find cpu_features

--- CMakeLists.txt.orig	2021-10-07 07:53:10 UTC
+++ CMakeLists.txt
@@ -137,17 +137,17 @@ message(STATUS "CMAKE_INSTALL_PREFIX:     ${CMAKE_INST
 #------------------------------------------------------------------------------
 # Third-party code...
 #------------------------------------------------------------------------------
-find_package(CpuFeatures CONFIG)
-if (NOT CpuFeatures_FOUND)
+#find_package(CpuFeatures CONFIG)
+if (FALSE AND NOT CpuFeatures_FOUND)
   message(STATUS "CpuFeatures: pre-installed CpuFeatures not found")
   add_subdirectory(cmake/third-party/cpu-features)
 else()
-  message(STATUS "CpuFeatures: found")
-  add_library(cpu_features ALIAS CpuFeatures::cpu_features)
-  get_target_property(
-    CpuFeatures_INCLUDE_DIR
-    CpuFeatures::cpu_features
-    INTERFACE_INCLUDE_DIRECTORIES)
+#  message(STATUS "CpuFeatures: found")
+#  add_library(cpu_features ALIAS CpuFeatures::cpu_features)
+#  get_target_property(
+#    CpuFeatures_INCLUDE_DIR
+#    CpuFeatures::cpu_features
+#    INTERFACE_INCLUDE_DIRECTORIES)
 endif()
 
 if (HEXL_TESTING OR HEXL_BENCHMARK OR HEXL_DEBUG)