internal/rosa: remove xz utils hack

This replaces all xz invocations with the native decompressor. This also significantly cleans up the Gentoo stage3 bootstrap path.

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

internal/rosa/package/gnu.az

@@ -292,11 +292,14 @@ package findutils {
 	anitya = 812;
 
 	version# = "4.11.0";
-	source = remoteFile {
+	source = remoteTar {
 		url = "https://ftpmirror.gnu.org/gnu/findutils/findutils-"+version+".tar.xz";
+		compress = xz;
 		checksum = "X-qsv9aUoBL583q-4iZcBI3_7Ufd3fSIqFmNLXWdEpUihlRfMpGGyAUt8SAvDKae";
 	};
 
+	writable = true;
+	chmod = true;
 	early = `
 echo '#!/bin/sh' > gnulib-tests/test-c32ispunct.sh
 echo 'int main(){return 0;}' > gnulib-tests/test-fstatat.c
@@ -307,7 +310,6 @@ echo 'int main(){return 0;}' > tests/xargs/test-sigusr.c
 
 	inputs = [
 		diffutils,
-		xz,
 		sed,
 	];
 }