Fix build with newer linux headers

Change-Id: Ibfdcec60567ec357205fa137257f2d8cba44b01c
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/src/vppinfra/linux/syscall.h b/src/vppinfra/linux/syscall.h
index 1ae029d..c07cad6 100644
--- a/src/vppinfra/linux/syscall.h
+++ b/src/vppinfra/linux/syscall.h
@@ -19,11 +19,13 @@
 #include <unistd.h>
 #include <sys/syscall.h>
 
+#ifndef HAVE_GETCPU
 static inline int
-getcpu (unsigned *cpu, unsigned *node, void *tcache)
+getcpu (unsigned *cpu, unsigned *node)
 {
-  return syscall (__NR_getcpu, cpu, node, tcache);
+  return syscall (__NR_getcpu, cpu, node, 0);
 }
+#endif
 
 static inline long
 set_mempolicy (int mode, const unsigned long *nodemask, unsigned long maxnode)