"make dist" fixes from Ralf Wildenhues.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4010 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/Makefile.am b/coregrind/Makefile.am
index 8a1b9c4..262a5c7 100644
--- a/coregrind/Makefile.am
+++ b/coregrind/Makefile.am
@@ -65,6 +65,7 @@
 	pub_core_skiplist.h	\
 	pub_core_stacks.h	\
 	pub_core_stacktrace.h	\
+	pub_core_syscall.h	\
 	pub_core_syswrap.h	\
 	pub_core_threadmodel.h	\
 	pub_core_threadstate.h	\