agent: Fix last commit.

* configure.ac: Check ucred.h as well as sys/ucred.h.
* agent/command-ssh.c: Add inclusion of ucred.h.

--

It was T2981, adding ucred.h for Solaris.  We also need sys/ucred.h
for FreeBSD and macOS.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

agent/command-ssh.c

@@ -47,6 +47,9 @@
 #ifdef HAVE_SYS_UCRED_H
 #include <sys/ucred.h>
 #endif
+#ifdef HAVE_UCRED_H
+#include <ucred.h>
+#endif
 
 #include "agent.h"
 

configure.ac

@@ -1278,7 +1278,7 @@ AC_HEADER_STDC
 AC_CHECK_HEADERS([string.h unistd.h langinfo.h termio.h locale.h getopt.h \
                   pty.h utmp.h pwd.h inttypes.h signal.h sys/select.h     \
                   stdint.h signal.h util.h libutil.h termios.h \
-                  sys/ucred.h sys/sysmacros.h sys/mkdev.h])
+                  ucred.h sys/ucred.h sys/sysmacros.h sys/mkdev.h])
 
 AC_HEADER_TIME