utf8.c: Add missing 'const' to formal parameter

This makes it match the embed.fnc entry.  For some reason no warning was
given except by the Win32 compiler

1 files changed, 1 insertions, 1 deletions

diff --git a/utf8.c b/utf8.c
index c84fa98310..e8e143c49e 100644
--- a/utf8.c
+++ b/utf8.c
@@ -2604,7 +2604,7 @@ S_warn_on_first_deprecated_use(pTHX_ const char * const name,
 
 bool
 Perl__is_utf8_FOO(pTHX_       U8   classnum,
-                        const U8   *p,
+                        const U8   * const p,
                         const char * const name,
                         const char * const alternative,
                         const bool use_utf8,