Nouveau - Nov 2015 - PATCH: Sense if git should be used (for tarball) and if typeof needs, to be __typeof__

I'd like to submit the attached patch to configure.ac fixing two issues:
1. Packaging systems such as pkgsrc use source tarballs not git, so configure
   could try to see if it's really in a git repository else use ChangeLog
   to determine the driver date to use.  
   NB 'git log' should probably already be 'git log -1'

2. When using strict ISO C compilers, such as if using -std=c99 instead of 
   for example -std=gnu99, typeof is not a valid keyword and __typeof__ should
   be used.  Use AC_C_TYPEOF to automatically define a macro if necessary.

cheers
-- 
Richard PALO

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