Make unified builds the default on Unix

Reviewed-by: Matt Caswell <matt@openssl.org>

Configurations/00-base-templates.conf

diff --git a/Configurations/00-base-templates.conf b/Configurations/00-base-templates.conf
index cf50785..b7dcde0 100644
--- a/Configurations/00-base-templates.conf
+++ b/Configurations/00-base-templates.conf
@@ -35,9 +35,6 @@
 	shared_ldflag	=> "",
 	shared_rcflag	=> "",
 	shared_extension	=> "",
-
-	build_scheme	=> "unixmake",
-	build_file	=> "Makefile",
     },
 
     BASE_common => {
@@ -72,7 +69,7 @@
                 }
                 return (); },
 
-        build_scheme    => "unixmake",
+        build_scheme    => [ "unified", "unix" ],
         build_file      => "Makefile",
     },