[roll] Roll fuchsia [starnix] fd_impl_nonblocking

Remove the default implementation of FileOps::wait_async
and create the fd_impl_nonblocking macro for a dummy
implementation of wait_async. This way, implementors
of FileOps will either need to mark the object as
non-blocking with this macro or implement wait_async
and future blocking-related methods.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/594749
Original-Revision: 1c51c9ecc91dddbff84b16a3da015d6acef98d49
GitOrigin-RevId: 694ddbd07c48665ea15e5b05dccb9799358db44b
Change-Id: I38f31d81149742cde44c9740a29eaff7ce58f801
diff --git a/stem b/stem
index 85e6e68..c357284 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
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-             revision="73641596959e4b257b4b39484cd01d3c92410059"/>
+             revision="1c51c9ecc91dddbff84b16a3da015d6acef98d49"/>
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