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approach. This way can handle spaces in paths.

We were changing n_capabilities after we had released the
Capabilities, which lead to a range of interesting crashes.  This
should fix test failures in setnumcapabilities001.

Thanks to @akio on the ticket for the diagnosis and the patch.  I
modified the comments a bit.

Requested by Gabor Greif.

This means that "./sync-all commit" will record in submodules first,
and then prompt you to record a patch updating the version of the
submodules last. Should make it less likely that we forget to update
the submodules' versions.

If anyone wants to do this in the future, they should just set
appropriate CC_OPTS/LD_OPTS variables instead.

Apparently git ignores the --git-dir argument.

Based on a patch from rassilon.

It required the old build system, so didn't work.

This porting method has bitrotted; use cross-compilation now

From StephenBlackheath

This solves the problem of how to define MIN_VERSION_base for
the binary package.

Also fixed a couple of build system bugs along the way.