sh/init: Detect a mounted /proc without sleeping

Previously we checked if /proc was alive by reading /proc/uptime twice
with a 1 second sleep between calls, so that it had time to update.
This got a complaint of an entire 1 second delay, so we improve the
check to be much faster without sleep. We cannot continue to use
/proc/uptime as it only has a 10ms resolution.

X-Gentoo-Bug: 348416
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=348416
Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>

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