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cleans up procfs mount

solver: don't clobber package swaps in cases where an installed package is being replaced by a provider

Fixes regression from commit 5ba27c90 which caused stdio
buffering issues now that output is split to stderr/stdout.

See also commit 51737872 for some of the history.

Fixes #7107

On some (probably buggy) terminals, printing up to the rightmost column
may end up with the terminal issueing a newline (probably due to putting
the cursor at the next char -> new line).

Some other progress bars avoid it by not reaching the rightmost column.

Shorten the bar width from term-width - 7 to -8 (the 7 are "xxx% []").

This fixes regression introduced by commit 72b878e6

this fixes build on ppc64le

The virtual package provider still needs to be explicitly
given on command line.

fixes #5616

The original intention was not use unnecessary space on tmpfs
e.g. if the cache directory is a mount point, but accidentally
left unmounted. But there are valid cases when packages are
intentionally wanted to be cached on tmpfs. If caching is not
desired, the user can just remove the cache directory.

musl c-library does not work properly without /proc, and potentially
running the scripts need this.

This allows for instance integration of etckeeper

[TT: Reorganized code a bit, and modified to use single
directory commit_hooks.d with argument for script of stage.]

Currently apk only knows about powerpc and ppc64. I am adding support for ppc64le.
ppc64le is the based on the ABI v2, which defines the endianess as little,
while ppc64 is based on the first 64-bits ABI.

It is unreasonable to assume that all package writers would except
to reset umask themselves. It's done currently in most packages,
but we had first issue of this kind recently, so better just reset
umask.

trigger it only if apk-tools can be upgrade, add test cases

print license with the --license option.

Make it possible to individually override openssl, zlib and libfetch
cflags and linker flags. This makes it possible to build apk-tools
without having pkg-config installed.

fixes #5656

it's only used to speed up things, and having it non-existant
is not a fatal error - all included things in index will be
passed in command line anyway