Instead of just a Makefile. Also set version to 1.10.0 (instead of
1.10) to follow semantic versioning.

It is used by other projects, so lets rename it to something that
sounds less termux specific.  Keep repo name, and projet name in
configure.ac, as termux-elf-cleaner though.

To change name of produced binary to termux-elf-cleaner we can use
--program-prefix=termux- when configuring.

As recommended by the GPL.

Similar to what emacs uses.  Will make it easier to add more options
in future updates.

Print info about termux-elf-cleaner and copyright information if
given.

In all printed messages, use PACKAGE_NAME instead.

If given, none of the info messages about removed entries will be
printed (error messages are printed in both cases though).

We can then choose target api level during runtime and not just at
compile time. --api-level NN can be used to choose for example api
level 21, 24 or 30.  If argument is omitted, then 21 is used.

To allow for checking if there are any unsupported entries in a
program, but without modifying the program.

If any such entries are found.  Ported from:
https://github.com/Lzhiyong/termux-ndk/blob/master/patches/align_fix.py

It is not supported on api level 22.

Lets simply run termux-elf-cleaner on some programs/libraries and
check so that output is what we expect.  This will allow us to check
so that updates do not break anything.

Add both un-cleaned ones, and cleaned ones for api level 24, for all
arches.

Valgrind needs the tls alignment fix, so add original as well as fixed
one that can be used for tests.

And remove author section, copyright info is kept individual file
headers.

Using similar action as for termux-{app,api, ..}.