internal/rosa/gnu: fix test suite flags

This sets the correct flag and also avoids changing ident per system.

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

internal/rosa/gnu.go

@@ -1,11 +1,6 @@
 package rosa
 
-import (
+import "hakurei.app/internal/pkg"
-	"runtime"
-	"strconv"
-
-	"hakurei.app/internal/pkg"
-)
 
 func (t Toolchain) newM4() pkg.Artifact {
 	const (
@@ -53,9 +48,10 @@ func (t Toolchain) newAutoconf() pkg.Artifact {
 		mustDecode(checksum),
 		pkg.TarGzip,
 	), &MakeAttr{
-		Env: []string{
+		Make: []string{
-			"TESTSUITEFLAGS=" + strconv.Itoa(runtime.NumCPU()),
+			`TESTSUITEFLAGS="-j$(nproc)"`,
 		},
+		Flag: TExclusive,
 	},
 		t.Load(M4),
 		t.Load(Perl),
@@ -109,8 +105,8 @@ func (t Toolchain) newLibtool() pkg.Artifact {
 		mustDecode(checksum),
 		pkg.TarGzip,
 	), &MakeAttr{
-		Env: []string{
+		Make: []string{
-			"TESTSUITEFLAGS=" + strconv.Itoa(runtime.NumCPU()),
+			`TESTSUITEFLAGS=32`,
 		},
 	},
 		t.Load(M4),