build system: stop including alloca.h, stdlib.h provides it

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
build system: "make hosttools" doesn't exist, remove it from "make help"

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ping: revert "try SOCK_DGRAM if no root privileges"

It wasn't working, and fixes on top of it would make ping
noticeably larger.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
find: fix a regression introduced with -HLP support

function                                             old     new   delta
find_main                                            294     342     +48

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
chown: fix help text

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
fakeidentd: fix use-after-free

function                                             old     new   delta
do_rd                                                199     197      -2

Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
networking: explain isrv_run() API

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
fixlet for the previous commit

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
fixlet for the previous commit #2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>