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Google uses `armv7-none-linux-androideabi`, analogous to
`armv7-unknown-linux-gnueabi` for e.g. a 32-bit regular linux.

The existing alias it not a mistake, it is the right one for 64 bit.
Google for that use `aarch64-linux-android`, analogous to
`aarch64-unknown-linux-android` for a 64-bi regular linux.

See https://developer.android.com/ndk/guides/standalone_toolchain for
evidence/details.

This is partial solution to #6807, because we invoke solver.
The follow-up will be to modify Rebuild monad so,
that it can be run without rebuilding (i.e. fail if cache is cold).

Rework verbosity parsing too and add tests.

This looks like an accident from a6e427ac
It causes cases like this to fail:

$ cat foo.c
int foo() { return 42; }
$ cat Lib.hs
module Lib where

foreign import ccall "foo" foo :: Int

bar = foo
$ cat cabal-csrc-repl.cabal
cabal-version:      2.4
name:               cabal-csrc-repl
version:            0.1.0.0
library
    exposed-modules:  Lib
    build-depends:    base ^>=4.14.0.0
    C-sources:        foo.c
    default-language: Haskell2010
$ cabal v2-repl
Resolving dependencies...
Build profile: -w ghc-8.10.1 -O1
In order, the following will be built (use -v for more details):
 - cabal-csrc-repl-0.1.0.0 (lib) (first run)
Configuring library for cabal-csrc-repl-0.1.0.0..
Preprocessing library for cabal-csrc-repl-0.1.0.0..
GHCi, version 8.10.1: https://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Lib              ( Lib.hs, interpreted )
Ok, one module loaded.
*Lib> foo
ghc: ^^ Could not load '_foo', dependency unresolved. See top entry above.

- Add availableSince to language/extension fields
   - Also autogen-modules once we are on that.
- Remove default-language check for cabal-version: 3.4

We cannot make the field `uniqueFieldAlaDef`, as that would require
specifying `default-language` in each subconditional.
I leave it for https://github.com/haskell/cabal/issues/6925

Note: the default language is whatever is the compiler's default.
The GHC-8.10 default is its variant of Haskell2010
with NondecreasingIndentation and without DatatypeContexts

This is preparation to solve #6083.
As such, this shouldn't affect anything yet.

Also change generator to generate only `= True` equations,
for licenseIsFsfLibre and licenseIsOsiApproved.

These should have been returning an error message but instead were
causing an internal error because disambiguateTargetSelectors was
rendering syntax and rematching on it, which isn't equivalent. Due to
the way syntaxForm1File renders, it does not add a FileStatus to its
TargetStringFileStatus and so cannot be matched upon again.
The fix is to just copy over the FileStatus from the match input.
This fixes #6874

If we need localeEncoding, that can be set outside.

Also add rawSystemIOWithEnvAndAction to allow
draining the spawned process output without async
(in a simple case of single output Handle).

Now it re-exports a collection of modules,
not individual symbols.

GHC <8.8 isn't able to read the "visibility" field from the package
database, since it's built against an older Cabal. For this reason,
using multiple public libraries with it did not work (all sublibraries
appeared as private).

This patch makes cabal-install override Cabal's library visibility
checks when GHC is older than 8.8, extending the multiple libraries
feature compatibiliy to older GHCs.

I.e. find out where we don't yet
used `Distribution.Client.Compat.Prelude`.

- If the module is small I added direct `Prelude` imports.
- Add Exception, deepseq stuff to Cabal Prelude
- Add Parsec, Pretty and Verbosity to Client Prelude
- use for, for_, traverse and traverse_ (removes need for Control.Monad)

To get exact match you can

    % cabal list ^QuickCheck$ -I
    * QuickCheck
        Synopsis: Automatic testing of Haskell programs
    ...

But not the prefix/suffix/regexp matching is in your power for
searching. e.g.

    % cabal list ^Cabal
    * Cabal
        Synopsis: A framework for packaging Haskell software
    ...
    * cabal-install
        Synopsis: The command-line interface for Cabal and Hackage.
    ...
    and many others

Also add a test for current behaviour
of https://github.com/haskell/cabal/issues/6083

And variant with mixin, for https://github.com/haskell/cabal/issues/6281

The tests are disable for GHC older than 8.8
Should they work?

Move Described functionality there, out of Cabal the library.
Similarly cabal-install doesn't contain Described instances,
they are only in tests.

This makes type-signatures awful, but using _ one can infer them.
Parsing performance doesn't seem to be affected.

Also move Newtypes to Distribution.FieldGrammar.Newtypes as that is
more correct place.