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Unmount mounts in reverse order of mounts. Precisely, filesystems before special devices. Fixes #12.

config: Ensure CPPFLAGS is empty by default

See merge request !6

Some configurations use "-Os -fomit-frame-pointer" as a default CPPFLAGS.
This is incorrect, and at least in the case of system/python3, causes a
miscompile on ppc64.  This is the true root cause of adelie/packages#451.

We set it empty in common to ensure that arch-specific overrides can still
happen; specifically, if we ever do the once-drafted Pentium 4 spin, we
may need some CPPFLAGS for the SSE2 stuff.

autobuilder: Export SHELL in build env

Closes #8

See merge request !5

Closes: #8

autobuilder: Fix generation of /etc/fstab

Closes #4

See merge request !4

File name should be /etc/fstab, not /etc.fstab.

Fixes: d3cc341d ("Add dummy '/etc/fstab' to rootfs environments. Fixes #4.")

autobuilder: use curl when available over wget

See merge request !2