Add missing header in Filesystem TS configure tests

2016-10-26  Uros Bizjak  <ubizjak@gmail.com>

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Include <limits.h>
	for PATH_MAX in realpath test.
	* configure: Regenerate.

From-SVN: r241548

libstdc++-v3/ChangeLog

+2016-10-26  Uros Bizjak  <ubizjak@gmail.com>
+
+	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Include <limits.h>
+	for PATH_MAX in realpath test.
+	* configure: Regenerate.
+
 2016-10-25  Jonathan Wakely  <jwakely@redhat.com>
 
 	* src/filesystem/ops.cc

libstdc++-v3/acinclude.m4

@@ -4290,6 +4290,7 @@ dnl
   AC_CACHE_VAL(glibcxx_cv_realpath, [dnl
     GCC_TRY_COMPILE_OR_LINK(
       [
+       #include <limits.h>
        #include <stdlib.h>
        #include <unistd.h>
       ],

libstdc++-v3/configure

@@ -80056,6 +80056,7 @@ else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+       #include <limits.h>
        #include <stdlib.h>
        #include <unistd.h>
 
@@ -80088,6 +80089,7 @@ fi
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
+       #include <limits.h>
        #include <stdlib.h>
        #include <unistd.h>