building packages while git is installed in build chroot fails now

In the newest abuild version in Alpine edge, it behaves as follows:

$ pmbootstrap -y zap
$ pmbootstrap chroot -- apk add git
$ pmbootstrap build hello-world --force

>>> hello-world: Building pmos/hello-world 1-r4 (using abuild 3.5.0_rc1-r1) started Sun, 10 Nov 2019 08:40:52 +0000
fatal: not a git repository (or any of the parent directories): .git                                                                              
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git                                                                              
>>> ERROR: hello-world: all failed

This is rather urgent, so I'm preparing a fix right now.

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