Update PortAudio to latest master.

dechamps · dechamps · commit 84b758a244d5 · 2019-02-03T11:15:35.000Z
diff --git a/src/portaudio b/src/portaudio
@@ -1 +1 @@
-Subproject commit 76e31c2a24eebfa95a704f711dd707a2635af77e
+Subproject commit b7870b08f770c1e84b754e662c08b6942ff7d021
