Get it to work on Android

- Add NBBY define
- Add empty stubs for setprotent()/endprotoent()
- Pre-gen version.c
- Tweak config.h:
 . undef stuff related to: bittypes.h hostton ntohost
   HAVE_GETRPCBYNUMBER

Change-Id: I29e80f185f79084230e95c134834f137b42b6725
diff --git a/version.c b/version.c
new file mode 100644
index 0000000..6481d27
--- /dev/null
+++ b/version.c
@@ -0,0 +1 @@
+const char version[] = "4.5.1";