[RFC, PATCH] shrink resolver code a bit

[Bernhard Fischer]

Hi,

The attached patch is an untested fallout from looking through resolv.c

It fixes one potential bug in gethostent_r (see also the factored out
snippet in buildroot/toolchain/uClibc/*29-fix-geth*).

The rest is just random shrinkage that tries to be least intrusive.

Stats for a quite feature-rich config, including ipv6:
   text    data     bss     dec     hex filename
 224525    1584   18572  244681   3bbc9 lib.oorig/libuClibc-0.9.29.so
 224381    1584   18572  244537   3bb39 lib/libuClibc-0.9.29.so


Comments?

PS: The comment for __dn_expand() talks about res_comp(), the latter
isn't defined anywhere, though. Is this done on purpose?
Should all of the res_*() depend on some kind of INET_BSD_COMPAT knob?
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