internal/rosa/package: migrate python packages

This also migrates LLVM LIT via the newly implemented special case.

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

internal/rosa/package/lit.az

@@ -0,0 +1,15 @@
+package lit {
+	description = "a portable tool for executing LLVM and Clang style test suites";
+	website = "https://llvm.org/docs/CommandGuide/lit.html";
+
+	source = llvm-project;
+
+	exec = pip {
+		append = [ "llvm", "utils", "lit" ];
+		// already checked during llvm
+		skipCheck = true;
+	};
+
+	inputs = [ python-setuptools ];
+	runtime = [ python ];
+}