Support for msvc batched build

[Thiago Macieira]

Christian Ehrlicher wrote:
>It improves compile time a lot and maybe the gcc folks should think
>about this feature too ;-)

As long as it doesn't interfere with parallel builds, no problem. I am all 
for decreasing compilation time.

koffice build took me over 4h.
-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
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5. Swa he géanhwearf tó timbran, and hwonne he cóm, lá! Unix cwæð "Hello, 
World". Ǽfre ǽghwilc wæs glæd and seo woruld wæs fréo.
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