flatpak 1.15.1

Dependencies:

* When building with Meson, gpgme 1.8.0 is now required.
  Older versions can still be used by building with Autotools.

Features:

* If an old temporary deploy directory was leaked by versions before #5146,
  clean it up the next time the same app is updated (#5164)

Bug fixes:

* If an app update is blocked by parental controls policies, clean up the
  temporary deploy directory (#5146)
* Fix Autotools build with versions of gpgme that no longer provide
  gpgme-config(1) (#5173)
* Fix a possible parallel build failure with Meson (#5165)
* Fix a compiler warning on 32-bit architectures (#5148)
* When building with Autotools, be more consistent about applying compiler
  warning flags (#5149)
* Unset $TEMP, $TEMPDIR and $TMP for apps, the same as $TMPDIR (#5168)
* Treat /efi the same as /boot/efi (#5155)

Git-EVTag-v0-SHA512: 7afbdf3846d86e1e1b5459e71ee499ee338068a6929203c151705a9da5d117efe4fb752fc9d2a17610fa034aec6c7326a0f43482663b5971f9e80757dad9393b
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