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Introduce prototype-style definition for wcschr.  This happened upstream
in:

commit fb78612a963cfe1299b33b1c60a0c24a206276c3
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Wed Feb 25 16:22:10 2015 -0300

    powerpc: Fix __wcschr static build

diff --git a/wcsmbs/wcschr.c b/wcsmbs/wcschr.c
index 56511d88176fa1f0..b3fded42692b1797 100644
--- a/wcsmbs/wcschr.c
+++ b/wcsmbs/wcschr.c
@@ -23,9 +23,7 @@
 #endif
 
 wchar_t *
-wcschr (wcs, wc)
-     const wchar_t *wcs;
-     const wchar_t wc;
+wcschr (const wchar_t *wcs, const wchar_t wc)
 {
   do
     if (*wcs == wc)