Update sha for corefx to pick up change to generate version by default (#746)

dseefeld · web-flow · commit 52543a647b09 · 2018-09-07T13:55:38.000-05:00
Fixes #651
diff --git a/src/corefx b/src/corefx
@@ -1 +1 @@
-Subproject commit 952b260f230afb771e8aa65586ea213418641082
+Subproject commit 9dfcd8fb53dd0e388a81e328b55f68409c7333ad
