bubblewrap 0.7.0

New features:

* `--size` option controls the size of a subsequent `--tmpfs` (#509)
* Better error messages if a mount operation fails (#472)
* Better error message if creating the new user namespace fails with
  `ENOSPC` (#487)
* When building as a Meson subproject, a `RUNPATH` can be set on the
  executable to make it easier to bundle its `libcap` dependency

Bug fixes:

* When building with Autotools, ensure initial setup for `pkg-config`
  is not disabled by `--with-bash-completion-dir=PATH` (#316, #342, #441)
* Fix test failures when running as uid 0 but with limited capabilities
  (#510)
* Use POSIX `command -v` in preference to non-standard `which` (#527)
* Fix a copy/paste error in `--help` (#531)

Git-EVTag-v0-SHA512: f4f6e2a92493461c2c39bacc1c3003167162113c88d2142f2041dcb830f3bd3a7df541aad361d1e6ce99576d66bd7eac1065340406e294cd4769b9c4c81c2a2c
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