Merge pull request libgit2#6013 from lolgear/cmake_hash_sha_missing_header

CMake. hash sha1 header has been added.

Author: ethomson

cmake/SelectHashes.cmake

@@ -56,6 +56,7 @@ ELSE()
 	MESSAGE(FATAL_ERROR "Asked for unknown SHA1 backend: ${USE_SHA1}")
 ENDIF()
 
+list(APPEND SRC_SHA1 "hash/sha1.h")
 list(SORT SRC_SHA1)
 
 ADD_FEATURE_INFO(SHA ON "using ${USE_SHA1}")