[newlib-cygwin] Add missing declarations of str{n}casecmp_l to strings.h.

[newlib-cygwin] Add missing declarations of str{n}casecmp_l to strings.h.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=80e0ad1e77a9365b85ffda62aa1471e5c8768743

commit 80e0ad1e77a9365b85ffda62aa1471e5c8768743
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Aug 23 17:40:03 2016 +0200

    Add missing declarations of str{n}casecmp_l to strings.h.
    
    Per glibc, both funcs are defined as GNU visible in strings.h.
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 newlib/libc/include/strings.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/newlib/libc/include/strings.h b/newlib/libc/include/strings.h
index e467467..b462d07 100644
--- a/newlib/libc/include/strings.h
+++ b/newlib/libc/include/strings.h
@@ -33,6 +33,11 @@ int	 _EXFUN(ffs,(int));
 int	 _EXFUN(strcasecmp,(const char *, const char *));
 int	 _EXFUN(strncasecmp,(const char *, const char *, size_t));
 
+#if __GNU_VISIBLE
+extern int strcasecmp_l (const char *, const char *, locale_t);
+extern int strncasecmp_l (const char *, const char *, size_t, locale_t);
+#endif /* _GNU_VISIBLE */
+
 _END_STD_C
 
 #endif /* !(_STRING_H_ && __BSD_VISIBLE) */