Allow libressl 4.4.0

Index: openssl-sys/build/main.rs
--- openssl-sys/build/main.rs.orig
+++ openssl-sys/build/main.rs
@@ -430,6 +430,7 @@ See rust-openssl documentation for more information:
             (4, 1, _) => ('4', '1', 'x'),
             (4, 2, _) => ('4', '2', 'x'),
             (4, 3, _) => ('4', '3', 'x'),
+            (4, 4, _) => ('4', '4', 'x'),
             _ => version_error(),
         };
 
