Add musyx/stream.c, match and link arith.c

Former-commit-id: 7bd0748d30

configure.py

@@ -860,7 +860,7 @@ LIBS = [
             ["Runtime/alloc", False],
             ["Runtime/ansi_files", True],
             "Runtime/ansi_fp",
-            "Runtime/arith",
+            ["Runtime/arith", True],
             ["Runtime/buffer_io", True],
             ["Runtime/ctype", True],
             ["Runtime/locale", True],
@@ -923,7 +923,7 @@ LIBS = [
             "musyx/synth",
             ["musyx/seq_api", True],
             ["musyx/snd_synthapi", False, False],
-            "musyx/stream",
+            ["musyx/stream", False],
             "musyx/synthdata",
             "musyx/synthmacros",
             "musyx/synthvoice",