with the following additional commits:
* [e7100ae]->[60a41fa] headers: make check of system header explicit
+ * [1bf02c3]->[2e79dd2] wchar: Remove unused configure check.
+ * [8f3aa1f]->[ab43907] autoupdate
+ * [e138cd8]->[18a2e77] fdopendir: fix configure test
+ * [7a29e00]->[11639c6] nl_langinfo: avoid configure-time syntax error
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