[PATCH] Verify source files for a module only once during the build

[Dmitri Gribenko]

Hi,

Updated patch attached.  Changes:

- Fixed a bug where we would verify system headers if the build
session timestamp is not provided.
- Separated the build session timestamp into a separate option.  It
might have other uses in future.
- Added tests for the driver.
- Added libclang API to get the correct build session timestamp so
that clients can be sure that they get it right, instead of rolling
their own implementation.

Please review.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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