internal/rosa: flags for toolchain-dependent artifact

This is much cleaner to add extra flags to.

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

internal/rosa/cmake.go

@@ -13,7 +13,7 @@ func (t Toolchain) newCMake() pkg.Artifact {
 		version  = "4.2.1"
 		checksum = "Y3OdbMsob6Xk2y1DCME6z4Fryb5_TkFD7knRT8dTNIRtSqbiCJyyDN9AxggN_I75"
 	)
-	return t.New("cmake-"+version, false, []pkg.Artifact{
+	return t.New("cmake-"+version, 0, []pkg.Artifact{
 		t.Load(Make),
 		t.Load(KernelHeaders),
 	}, nil, nil, `
@@ -96,8 +96,13 @@ chmod -R +w "${ROSA_SOURCE}"
 		prefix = AbsSystem
 	}
 
+	var flag int
+	if attr.Exclusive {
+		flag |= TExclusive
+	}
+
 	sourcePath := AbsUsrSrc.Append(name)
-	return t.New(name+"-"+variant+"-"+version, attr.Exclusive, stage3Concat(t, attr.Extra,
+	return t.New(name+"-"+variant+"-"+version, flag, stage3Concat(t, attr.Extra,
 		t.Load(CMake),
 		t.Load(Ninja),
 	), nil, slices.Concat([]string{