syscalls/fcntl35.c: add new regression test

We add a regression test to check that pipe-max-size caps the
initial allocation for a new pipe for unprivileged users, but
not for privileged users.

This kernel bug has been fixed by:
'086e774a57fb(pipe: cap initial pipe capacity according to
pipe-max-size limit)'

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
diff --git a/runtest/syscalls b/runtest/syscalls
index fe52272..32c65c6 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -267,6 +267,8 @@
 fcntl33_64 fcntl33_64
 fcntl34 fcntl34
 fcntl34_64 fcntl34_64
+fcntl35 fcntl35
+fcntl35_64 fcntl35_64
 
 fdatasync01 fdatasync01
 fdatasync02 fdatasync02