strcasecmp() was initially declared in string.h and subsequently moved
to strings.h. For historical reasons it still exists in string.h, but
would require _DEFAULT_SOURCE to be defined.

Due to the above, just include strings.h as currently dictated by the
manpage.

Fixes the following warning:

keying-material-exporter-demo/keyingmaterialexporter.c:155:14: warning: 
implicit declaration of function  strncasecmp’; did you mean ‘strncmp’? 
[-Wimplicit-function-declaration]
  155 |         if (!strncasecmp(objbuf, "CN", 2))
      |              ^~~~~~~~~~~
      |              strncmp

Signed-off-by: Antonio Quartulli <a...@unstable.cc>
---
 .../keying-material-exporter-demo/keyingmaterialexporter.c       | 1 +
 1 file changed, 1 insertion(+)

diff --git 
a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c 
b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
index 1f47cb35..e2820418 100644
--- 
a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
+++ 
b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
@@ -29,6 +29,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <strings.h>
 #include <stdlib.h>
 
 #include "openvpn-plugin.h"
-- 
2.34.1



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