dbus-sysdeps-util-unix.c: Avoid including sys/syslimits.h

This header is GCC specific header that on my system just contains
`#include_next <limits.h>`. FreeBSD also provides this header but it
contains a `#warning` that it should not be used. Replace the one use
with `#include <limit.h>` and drop the configure checks.

(cherry picked from commit a214ed824d)
Backported-from: dbus!280

cmake/ConfigureChecks.cmake

@@ -34,7 +34,6 @@ check_include_file(sys/stat.h     HAVE_SYS_STAT_H)
 check_include_file(sys/types.h     HAVE_SYS_TYPES_H)
 check_include_file(sys/uio.h     HAVE_SYS_UIO_H)
 check_include_file(sys/prctl.h  HAVE_SYS_PRCTL_H)
-check_include_file(sys/syslimits.h    HAVE_SYS_SYSLIMITS_H)   # dbus-sysdeps-unix.c
 check_include_file(sys/time.h   HAVE_SYS_TIME_H)# dbus-sysdeps-win.c
 check_include_file(sys/wait.h   HAVE_SYS_WAIT_H)# dbus-sysdeps-win.c
 check_include_file(time.h       HAVE_TIME_H)    # dbus-sysdeps-win.c

cmake/config.h.cmake

@@ -151,9 +151,6 @@
 #cmakedefine HAVE_SYS_RESOURCE_H 1
 #cmakedefine HAVE_SYS_STAT_H 1
 
-/* Define to 1 if you have sys/syslimits.h */
-#cmakedefine   HAVE_SYS_SYSLIMITS_H 1
-
 /* Define to 1 if you have sys/time.h */
 #cmakedefine    HAVE_SYS_TIME_H 1
 

configure.ac

@@ -424,7 +424,6 @@ stdint.h
 sys/prctl.h
 sys/random.h
 sys/resource.h
-sys/syslimits.h
 sys/time.h
 unistd.h
 ws2tcpip.h

dbus/dbus-sysdeps-util-unix.c

@@ -43,6 +43,7 @@
 #include <stdio.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <sys/stat.h>
 #ifdef HAVE_SYS_RESOURCE_H
 #include <sys/resource.h>
@@ -56,10 +57,6 @@
 #include <sys/prctl.h>
 #endif
 
-#ifdef HAVE_SYS_SYSLIMITS_H
-#include <sys/syslimits.h>
-#endif
-
 #ifdef HAVE_SYSTEMD
 #include <systemd/sd-daemon.h>
 #endif