internal/rosa: chmod via patch helper

This works around the zfs overlay mount overhead and significantly reduces I/O in general.

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

internal/rosa/ninja.go

@@ -12,7 +12,6 @@ func (t Toolchain) newNinja() pkg.Artifact {
 		t.Load(Python),
 		t.Load(Bash),
 	}, nil, nil, `
-chmod -R +w /usr/src/ninja/
 mkdir -p /work/system/bin/ && cd /work/system/bin/
 python3 /usr/src/ninja/configure.py \
 	--bootstrap \
@@ -25,12 +24,13 @@ python3 /usr/src/ninja/configure.py \
 				"v1.16.0/googletest-1.16.0.tar.gz",
 			mustDecode("NjLGvSbgPy_B-y-o1hdanlzEzaYeStFcvFGxpYV3KYlhrWWFRcugYhM3ZMzOA9B_"),
 			pkg.TarGzip,
-		)), pkg.Path(AbsUsrSrc.Append("ninja"), true,
-		pkg.NewHTTPGetTar(
+		)), pkg.Path(AbsUsrSrc.Append("ninja"), true, t.NewPatchedSource(
+		"ninja", version, pkg.NewHTTPGetTar(
 			nil, "https://github.com/ninja-build/ninja/archive/refs/tags/"+
 				"v"+version+".tar.gz",
 			mustDecode(checksum),
 			pkg.TarGzip,
-		)))
+		), false,
+	)))
 }
 func init() { artifactsF[Ninja] = Toolchain.newNinja }