Added regression tests that verify the following behavior:
- On Linux, whether Valgrind properly intercepts the system calls that access
  /proc/self/cmdline, /proc/<pid>/cmdline, /proc/self/exe and /proc/<pid>/exe.
- On Darwin, whether Valgrind does not modify the behavior of the system calls
  that access the aforementioned files.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10871 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index bd3df63..fd5a4b5 100644
--- a/configure.in
+++ b/configure.in
@@ -1526,6 +1526,7 @@
         pthread_rwlock_timedrdlock \
         pthread_rwlock_timedwrlock \
         pthread_spin_lock          \
+        readlinkat   \
         semtimedop   \
         signalfd     \
         sigwaitinfo  \