fixed checking for strlcat/strlcpy

newer clang uses a definition rather than a function

configure.ac

@@ -417,8 +417,9 @@ AC_FUNC_VPRINTF
 AC_CHECK_FUNCS([ \
 	getpass gettimeofday getline memset mkdir \
 	strdup strerror memset_s explicit_bzero \
-	strlcpy strlcat strnlen sigaction
+	strnlen sigaction
 ])
+AC_CHECK_DECLS([strlcpy, strlcat], [], [], [[#include <string.h>]])
 AC_CHECK_SIZEOF(void *)
 if test "${ac_cv_sizeof_void_p}" = 8; then
 	LIBRARY_BITNESS="64"

src/common/compat_strlcat.c

@@ -31,7 +31,7 @@
 #include "config.h"
 #endif
 
-#ifndef HAVE_STRLCAT
+#if !defined(HAVE_DECL_STRLCAT) || !HAVE_DECL_STRLCAT
 #include <sys/types.h>
 #include <string.h>
 

src/common/compat_strlcat.h

@@ -10,9 +10,11 @@
 #include "config.h"
 #endif
 
-#ifndef HAVE_STRLCAT
+#if !defined(HAVE_DECL_STRLCAT) || !HAVE_DECL_STRLCAT
 #include <stddef.h>
 size_t strlcat(char *dst, const char *src, size_t siz);
+#else
+#include <string.h>
 #endif
 
 #endif

src/common/compat_strlcpy.c

@@ -20,7 +20,7 @@
 #include "config.h"
 #endif
 
-#ifndef HAVE_STRLCPY	/* empty file if strlcpy is available */
+#if !defined(HAVE_DECL_STRLCPY) || !HAVE_DECL_STRLCPY
 #include <sys/types.h>
 #include <string.h>
 

src/common/compat_strlcpy.h

@@ -38,9 +38,11 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "config.h"
 #endif
 
-#ifndef HAVE_STRLCPY
+#if !defined(HAVE_DECL_STRLCPY) || !HAVE_DECL_STRLCPY
 #include <stddef.h>
 size_t strlcpy(char *dst, const char *src, size_t siz);
+#else
+#include <string.h>
 #endif
 
 #endif