Fix OpenSSL detection

Upstream: https://bugs.ntp.org/show_bug.cgi?id=3985

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>

diff -uNr ntp-4.2.8p18.orig/sntp/m4/ntp_openssl.m4 ntp-4.2.8p18/sntp/m4/ntp_openssl.m4
--- ntp-4.2.8p18.orig/sntp/m4/ntp_openssl.m4	2024-05-07 13:21:14.000000000 +0200
+++ ntp-4.2.8p18/sntp/m4/ntp_openssl.m4	2025-07-06 08:37:14.140657598 +0200
@@ -326,7 +326,7 @@
 	     not_found) ;;
 	     *)
 		AC_MSG_NOTICE([Searching for libcrypto in $i])
-		LIBS="-L$i $NTPSSL_SAVED_LIBS"
+		LIBS="-L$i $ntp_ssl_libs_l $NTPSSL_SAVED_LIBS"
 		AC_CHECK_LIB(
 		    [crypto],
 		    [EVP_MD_CTX_new],