Fix "make dist" regression

* Makefile.am (EXTRA_DIST): Remove README-linux.
diff --git a/Makefile.am b/Makefile.am
index 35ba7b8..47696e0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -141,7 +141,6 @@
 	CREDITS				\
 	ChangeLog			\
 	ChangeLog-CVS			\
-	README-linux			\
 	README-linux-ptrace		\
 	debian/changelog		\
 	debian/compat			\