This prevents gcc warnings:
warning: initializer-string for array of 'unsigned char' truncates
NUL terminator but destination lacks 'nonstring' attribute
While there is "nonstring" attribute, clang does not support it,
so this is the simplest solution.
This patch switches code to SPDX one-line license identifiers according to
https://spdx.dev/learn/handling-license-info/
and replacing long license text headers.
I used C++ format on the first line in style
// SPDX-License-Identifier: <id>
except exported libcryptsetup.h, when only C comments are used.
The only additional changes are:
- switch backend utf8.c from LGPL2+ to LGPL2.1+ (as in systemd)
- add some additional formatting lines.
