Update m4 to fix a bunch of warnings

d6fa6891 · Marvin Scholz · 95fb449d · 57027c6c
Commit d6fa6891 authored Nov 28, 2015 by Marvin Scholz
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m4 m4 +1 -1

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--- a/m4 @ 57027c6c
+++ b/m4 @ 57027c6c
-Subproject commit 17a3e5932cde41df7c4c1d0f42919c9ddfb99274
+Subproject commit 57027c6cc3f8b26d59e9560b4ac72a1a06d643b9