Fix .external, adding monodroid back

Bret Johnson · Bret Johnson · commit 00754c05dff1 · 2020-05-14T15:46:53.000-04:00
diff --git a/.external b/.external
@@ -1 +1,2 @@
+xamarin/monodroid:master@9242fa4fe5df2413faf12689c522825404b90755
 mono/mono:2020-02@075c3f06197e3b969f4234d0f56a2e10ee6ee305

Original file line number	Diff line number	Diff line change
`@@ -1 +1,2 @@`
	`1`	`+xamarin/monodroid:master@9242fa4fe5df2413faf12689c522825404b90755`
`1`	`2`	`mono/mono:2020-02@075c3f06197e3b969f4234d0f56a2e10ee6ee305`