mesa: Fix generation of git_sha1.h.tmp for gitlinks
Don't assume that $(top_srcdir)/.git is a directory. It may be a gitlink file [1] if $(top_srcdir) is a submodule checkout or a linked worktree [2]. [1] A "gitlink" is a text file that specifies the real location of the gitdir. [2] Linked worktrees are a new feature in Git 2.5. Cc: "10.6, 10.5" <mesa-stable@lists.freedesktop.org> Reviewed-by:Iago Toral Quiroga <itoral@igalia.com> (cherry picked from commit 75784243)
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