[Nouveau] update for git 1.6

[Hervé Cauwelier]

I refresh my checkout and ran autoconf, and I noticed an error with git:

  ./configure: line 1976: git-log: command not found

Indeed the syntax with a dash was deprecated and has been completely
removed since version 1.6.

I found two git calls with the dash. Here is a patch to remove them.

Regards,

Hervé
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