Added build test without libnettle, libgcrypt and openssl.

build_test.sh

@@ -43,6 +43,8 @@ case "$1" in
 	;;
     *)
 	# Library combinations
+	build "--without-libnettle --without-libgcrypt --without-openssl" \
+	    "nodigest"
 	build "--without-libnettle --with-libgcrypt" "libgcrypt"
 	build "--without-gnutls" "openssl"
 	build "--without-gnutls --without-openssl" "nossl"