rename config-versio.h -> graphviz_version.h, distribute and install it

diff --git a/config_version.h b/config_version.h
deleted file mode 100644 (file)
index 40a2f1f..0000000
--- a/config_version.h
+++ /dev/null
@@ -1 +0,0 @@
-/* This is a stub - the real one is generated during packaging */