added include guards to compatibility headers

src/common/compat_strlcat.h

@@ -1,9 +1,18 @@
 /**
  * @file
- * @brief prototypes of strlcpy()/strlcat() imported from OpenBSD
+ * @brief prototypes of strlcat() imported from OpenBSD
  */
 
+#ifndef __COMPAT_STRLCAT_H
+#define __COMPAT_STRLCAT_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #ifndef HAVE_STRLCAT
 #include <stddef.h>
 size_t strlcat(char *dst, const char *src, size_t siz);
 #endif
+
+#endif

src/common/compat_strlcpy.h

@@ -28,10 +28,19 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 /**
  * @file
- * @brief prototypes of strlcpy()/strlcat() imported from OpenBSD
+ * @brief prototypes of strlcpy() imported from OpenBSD
  */
 
+#ifndef __COMPAT_STRLCPY_H
+#define __COMPAT_STRLCPY_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #ifndef HAVE_STRLCPY
 #include <stddef.h>
 size_t strlcpy(char *dst, const char *src, size_t siz);
 #endif
+
+#endif

src/common/compat_strnlen.h

@@ -3,7 +3,16 @@
  * @brief prototype of strnlen() from OpenBSD
  */
 
+#ifndef __COMPAT_STRNLEN_H
+#define __COMPAT_STRNLEN_H
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #ifndef HAVE_STRNLEN
 #include <stddef.h>
 size_t strnlen(const char *str, size_t maxlen);
 #endif
+
+#endif