Add procfs-non-linux.stderr.exp variants to EXTRA_DIST.

For bz#344936 procfs-non-linux.stderr.exp was renamed and split into
procfs-non-linux.stderr.exp-with-readlinkat and
procfs-non-linux.stderr.exp-without-readlinkat add both to EXTRA_DIST.
Fixes make post-regtest-checks.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15271 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/none/tests/Makefile.am b/none/tests/Makefile.am
index 4edbeaa..4c35f65 100644
--- a/none/tests/Makefile.am
+++ b/none/tests/Makefile.am
@@ -127,7 +127,9 @@
 	procfs-linux.stderr.exp-with-readlinkat \
 	procfs-linux.stderr.exp-without-readlinkat \
 	procfs-linux.vgtest \
-	procfs-non-linux.stderr.exp procfs-non-linux.vgtest \
+	procfs-non-linux.vgtest \
+	procfs-non-linux.stderr.exp-with-readlinkat \
+	procfs-non-linux.stderr.exp-without-readlinkat \
 	pth_atfork1.stderr.exp pth_atfork1.stdout.exp pth_atfork1.vgtest \
 	pth_blockedsig.stderr.exp \
 	pth_blockedsig.stdout.exp pth_blockedsig.vgtest \