Bug report - bootstrap script not compatible with git submodules

[Aaron Sowry]

Hi,

I've noticed that if the gnulib git tree is used as a submodule for a different
project, the git detection in the bootstrap script will not work properly. This
is because it checks for the existence of a .git directory, whereas for
submodules .git will be a file.

The fix is trivial, patch attached.

/Aaron

bootstrap.patch
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