[PATCH] init: allow to preserve init's command-line

[Nicolas CARRIER]

When launched as PID 1 and after parsing it's arguments, init wipes all
all of them except argv[0] and rewrites argv[0] to contain only "init",
so that it's command-line appears solely as "init" in tools such as ps.

This patch adds the FEATURE_PRESERVE_CMDLINE which, if set to Y, will make
init preserve all it's arguments including argv[0], be they parsed or
ignored.
The original command-line used to launch init can then be retrieved in
/proc/1/cmdline on Linux, for example.
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