Replace homegrown PID file functions with std BSD pidfile()

- Import pidfile() v1.11 from OpenBSD and libite (-lite) project
- Import utimensat() replacement, for systems that don't have it
- Simplify syslogd and klogd program start and PID file creation
- Rip out -i and -I from klogd, uses old PID file functions, and
  they're only kill(1) wrappers anyway

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

lib/utimensat.c

@@ -0,0 +1,47 @@
+/* Replacement in case utimensat(2) is missing
+ *
+ * Copyright (C) 2017-2018  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+#include <sys/time.h>		/* lutimes(), utimes(), utimensat() */
+
+int utimensat(int dirfd, const char *pathname, const struct timespec ts[2], int flags)
+{
+	int ret = -1;
+	struct timeval tv[2];
+
+	if (dirfd != 0) {
+		errno = ENOTSUP;
+		return -1;
+	}
+
+	TIMESPEC_TO_TIMEVAL(&tv[0], &ts[0]);
+	TIMESPEC_TO_TIMEVAL(&tv[1], &ts[1]);
+
+#ifdef AT_SYMLINK_NOFOLLOW
+	if ((flags & AT_SYMLINK_NOFOLLOW) == AT_SYMLINK_NOFOLLOW)
+		ret = lutimes(pathname, tv);
+	else
+#endif
+		ret = utimes(pathname, tv);
+
+	return ret;
+}