internal/rosa: improve helper bindings

This uses more intuitive names for some arguments and inverts their default value. Slices and nil-capable strings replace skip arguments.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/package/rsync.az

@@ -15,7 +15,8 @@ package rsync {
 	toyboxEarly = true;
 
 	exec = make {
-		omitDefaults = true;
+		defaults = false;
+
 		configure = {
 			"disable-openssl";
 			"disable-xxhash";
@@ -24,6 +25,6 @@ package rsync {
 		};
 
 		// circular dependency
-		skipCheck = true;
+		check = nil;
 	};
 }