[glib] Add missing checks for gnulib vasnprintf()

[Colin Walters <walters src gnome org>]

commit e9c9ff607c024b6daecccb577923c62c0f63cf63
Author: Andrey Gursky <andrey gursky e-mail ua>
Date:   Fri Nov 20 03:25:28 2015 +0100

    Add missing checks for gnulib vasnprintf()
    
    Commit 212e4232e7520b2e328e3e965ed792e17b12e144 introduced a big update
    of gnulib. Necessary changes to configure.ac from old gnulib commit
    e8e63d1b31bca6c82713cba490b21a861abb24b5 have been forgotten. Actually
    available functions are not discovered by autotools.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759134

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 339defc..13489a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1155,7 +1155,7 @@ gt_TYPE_WINT_T
 AC_TYPE_SIZE_T
 AC_CHECK_TYPES(ptrdiff_t)
 jm_AC_TYPE_INTMAX_T
-AC_CHECK_FUNCS([snprintf wcslen])
+AC_CHECK_FUNCS([snprintf strnlen wcslen wcsnlen mbrtowc wcrtomb])
 AC_FUNC_SNPRINTF_C99
 
 # Check if <sys/select.h> needs to be included for fd_set