internal/rosa: use string pair for files

This is a much cleaner representation than the separator syntax.

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

internal/rosa/package/libarchive/package.az

@@ -10,7 +10,7 @@ package libarchive {
 		checksum = "CUJK4MDQmZmATClgQBH2Wt-7Ts4iiSUlg1J_TVb6-5IK3rVUgVLIMc5k-bnWB9w3";
 	};
 
-	files = [ "CTestCustom.cmake" ];
+	files = { "CTestCustom.cmake"; };
 
 	writable = true;
 	early = "\ninstall -Dv /usr/src/CTestCustom.cmake /cure/\n";