Merge pull request libgit2#5216 from stinb/ntlm-openssl-headers

ntlm: fix failure to find openssl headers

Author: ethomson

deps/ntlmclient/CMakeLists.txt

@@ -9,6 +9,7 @@ IF (HTTPS_BACKEND STREQUAL "SecureTransport")
 	SET(SRC_NTLMCLIENT_CRYPTO "crypt_commoncrypto.c")
 ELSEIF (HTTPS_BACKEND STREQUAL "OpenSSL")
 	ADD_DEFINITIONS(-DCRYPT_OPENSSL)
+	INCLUDE_DIRECTORIES(${OPENSSL_INCLUDE_DIR})
 	SET(SRC_NTLMCLIENT_CRYPTO "crypt_openssl.c")
 ELSEIF (HTTPS_BACKEND STREQUAL "mbedTLS")
 	ADD_DEFINITIONS(-DCRYPT_MBEDTLS)