[PATCH] Cache xkbcomp output for fast start-up v2

[Li, Yan]

This is the v2 patch for your review. Changes since v1:
1. gratuitous changes are all removed
2. xkbcomp's results are cached in /var/cache/xkb

I've tested this patch with 1.6.0 release on i586 Linux.

Welcome comments.

N.B. although cares are taken, I have no environment to test the
Windows code path.

-- 
Li, Yan
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