Rely on Gnulib for 'select', 'lstat', and 'mkstemp'.

* libguile/iselect.h:
* libguile/threads.c:
* libguile/deprecated.h: Rely on Gnulib for sys/select.h.

* libguile/filesys.c: Rely on Gnulib for 'lstat' and 'mkstemp'.

libguile/deprecated.h

@@ -742,13 +742,11 @@ SCM_DEPRECATED SCM scm_c_make_keyword (const char *s);
 
 SCM_DEPRECATED unsigned int scm_thread_sleep (unsigned int);
 SCM_DEPRECATED unsigned long scm_thread_usleep (unsigned long);
-#if SCM_HAVE_SYS_SELECT_H
 SCM_DEPRECATED int scm_internal_select (int fds,
                                         fd_set *rfds,
                                         fd_set *wfds,
                                         fd_set *efds,
                                         struct timeval *timeout);
-#endif
 
 /* Deprecated because the cuserid call is deprecated.
  */

libguile/filesys.c

@@ -561,7 +561,6 @@ SCM_DEFINE (scm_stat, "stat", 1, 1, 0,
 }
 #undef FUNC_NAME
 
-#ifdef HAVE_LSTAT
 SCM_DEFINE (scm_lstat, "lstat", 1, 0, 0, 
             (SCM str),
 	    "Similar to @code{stat}, but does not follow symbolic links, i.e.,\n"
@@ -584,7 +583,6 @@ SCM_DEFINE (scm_lstat, "lstat", 1, 0, 0,
   return scm_stat2scm (&stat_temp);
 }
 #undef FUNC_NAME
-#endif /* HAVE_LSTAT */
 
 
 #ifdef HAVE_POSIX
@@ -1467,10 +1465,6 @@ SCM_DEFINE (scm_umask, "umask", 0, 1, 0,
 }
 #undef FUNC_NAME
 
-#ifndef HAVE_MKSTEMP
-extern int mkstemp (char *);
-#endif
-
 SCM_DEFINE (scm_mkstemp, "mkstemp!", 1, 0, 0,
 	    (SCM tmpl),
 	    "Create a new unique file in the file system and return a new\n"

libguile/iselect.h

@@ -28,8 +28,6 @@
 /* Needed for FD_SET on some systems.  */
 #include <sys/types.h>
 
-#if SCM_HAVE_SYS_SELECT_H
-
 #include <sys/select.h>
 
 SCM_API int scm_std_select (int fds,
@@ -40,8 +38,6 @@ SCM_API int scm_std_select (int fds,
 
 #define SELECT_TYPE fd_set
 
-#endif /* SCM_HAVE_SYS_SELECT_H */
-
 #endif  /* SCM_ISELECT_H */
 
 /*

libguile/threads.c

@@ -1884,14 +1884,6 @@ do_std_select (void *args)
   return NULL;
 }
 
-#if !SCM_HAVE_SYS_SELECT_H
-static int scm_std_select (int nfds,
-                           fd_set *readfds,
-                           fd_set *writefds,
-                           fd_set *exceptfds,
-                           struct timeval *timeout);
-#endif
-
 int
 scm_std_select (int nfds,
 		fd_set *readfds,