- Add missing BuildRequires on textfixtures.

- Update to 1.5.2:
* Fix #83, output formats "sed" and "gsed" to auto-fix some issues
* Fix #92, new category "build/namespaces_headers" for unnamed namespaces in header file
* Sort list of files before processing
* Fix #144 Falso positive for indent when using QT macros "signals" and "slots"
* Fix #76 Parsing of class decorators that also use digits
* Fix #139 Add message "Relative paths like . and .. are not allowed"
* Revert #43 behavior change for include order from 1.5.0, and hide it behind command-line-flag --includeorder=standardcfirst. It turns out there is no easy objective way to tell c system headers from certain c++ library headers, and Google cpplint intentionally classifies some C++ header includes as C system header for simplicity.
* Libraries considered as C system headers using --includeorder=standardcfirst now also includes linux-specifc headers (glibc-devel, glibc-kernheaders, linux-libc-dev).
* Fix #43 false positives in header include order by checking includes against a list of c headers. Since this interprets certain include lines different than before, output about header include order changes.
* Fix #135: allow 'if constexpr' in readability/braces.
* Fix runtime warning: Close files after reading contents