Change prctl() syscall wrapper to take prctl()'s full set of arguments

The Linux man page documents prctl() as taking upto 5 arguments:

       int prctl(int option, unsigned long arg2, unsigned long arg3,
                 unsigned long arg4, unsigned long arg5);

For example, PR_SET_SECCOMP with SECCOMP_MODE_FILTER takes a third
argument, and so isn't usable without this change.

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/23137020

git-svn-id: http://linux-syscall-support.googlecode.com/svn/trunk@24 829466d3-f3f5-3ae4-62ad-de35cf9bba21

lss/linux_syscall_support.h

diff --git a/lss/linux_syscall_support.h b/lss/linux_syscall_support.h
index 26bfe2c..d04901d 100644
--- a/lss/linux_syscall_support.h
+++ b/lss/linux_syscall_support.h
@@ -2822,8 +2822,11 @@
                        int,            f, int,    m)
   LSS_INLINE _syscall3(int,     poll,           struct kernel_pollfd*, u,
                        unsigned int,   n, int,    t)
-  LSS_INLINE _syscall2(int,     prctl,           int,         o,
-                       long,           a)
+  LSS_INLINE _syscall5(int,     prctl,           int,         option,
+                       unsigned long,  arg2,
+                       unsigned long,  arg3,
+                       unsigned long,  arg4,
+                       unsigned long,  arg5)
   LSS_INLINE _syscall4(long,    ptrace,          int,         r,
                        pid_t,          p, void *, a, void *, d)
   #if defined(__NR_quotactl)