internal/rosa/meson: respect preferred loadavg target and job count

This was missed when first implementing jobs and was missed again implementing loadavg.

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

internal/rosa/meson.go

@@ -58,6 +58,7 @@ func (attr *MesonHelper) script(t Toolchain, name string) string {
 	if !attr.SkipTest && t.opts&OptSkipCheck == 0 {
 		scriptTest = `
 meson test \
+	` + jobsFlagE + ` \
 	-t 10 \
 	--print-errorlogs`
 		if attr.InteractiveTest {
@@ -91,7 +92,9 @@ meson setup \
 		}
 	}), " \\\n\t") + ` \
 	. '/usr/src/` + name + `'
-meson compile` + scriptCompiled + scriptTest + `
+meson compile \
+	` + jobsFlagE + ` \
+	` + loadFlagE + scriptCompiled + scriptTest + `
 meson install \
 	--destdir=/work
 ` + attr.Script