Merge pull request #2539 from Kloen/re-killing-warnings

externals: nihstro, update to latest master. Again.

externals/nihstro

@@ -1 +1 @@
-Subproject commit 26a0a04a458df2b9ba6e39608bee183d8a0a00ec
+Subproject commit 7e24743af21a7c2e3cef21ef174ae4269d0cfdac