internal/rosa: bc artifact

Required by the kernel.

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

internal/rosa/gnu.go

@@ -386,6 +386,26 @@ echo 'int main(){return 0;}' > tests/xargs/test-sigusr.c
 }
 func init() { artifactsF[Findutils] = Toolchain.newFindutils }
 
+func (t Toolchain) newBC() pkg.Artifact {
+	const (
+		version  = "1.08.2"
+		checksum = "8h6f3hjV80XiFs6v9HOPF2KEyg1kuOgn5eeFdVspV05ODBVQss-ey5glc8AmneLy"
+	)
+	return t.NewViaMake("bc", version, t.NewPatchedSource(
+		"bc", version, pkg.NewHTTPGetTar(
+			nil, "https://ftpmirror.gnu.org/gnu/bc/bc-"+version+".tar.gz",
+			mustDecode(checksum),
+			pkg.TarGzip,
+		), false,
+	), &MakeAttr{
+		Writable: true,
+	},
+		t.Load(Perl),
+		t.Load(Texinfo),
+	)
+}
+func init() { artifactsF[BC] = Toolchain.newBC }
+
 func (t Toolchain) newBinutils() pkg.Artifact {
 	const (
 		version  = "2.45"