update musl builder to include arch specific process files

Signed-off-by: leongross <[email protected]>

Author: leongross

builder/musl.go

@@ -136,6 +136,7 @@ var libMusl = Library{
 			"thread/*.c",
 			"time/*.c",
 			"unistd/*.c",
+			"process/" + arch + "/*.s",
 			"process/*.c",
 		}
 		if arch == "arm" {