[PATCH] Remove C++ style comments from string3.h

[Adhemerval Zanella]

The new check-installed-headers rule check now complains with C++
comment from string3.h with:

../string/bits/string3.h:129:1: error: C++ style comments are not allowed in ISO C90
 // XXX We have no corresponding builtin yet.

Let use old C style comment to make compiler happy in old modes.

Tested on x86_64.

	* string/bits/string3.h: Remove C++ style comments.
---
 ChangeLog             | 4 ++++
 string/bits/string3.h | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/string/bits/string3.h b/string/bits/string3.h
index dd8db68..8f13b65 100644
--- a/string/bits/string3.h
+++ b/string/bits/string3.h
@@ -126,7 +126,7 @@ __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
 }
 
-// XXX We have no corresponding builtin yet.
+/* XXX We have no corresponding builtin yet.  */
 extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
 			    size_t __destlen) __THROW;
 extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
-- 
2.7.4