- add pkgconfig(DirectX-Headers) to BuildRequires
* This ensures that correect GPU info is shown when used by WSL

- update to 2.15.0
Changes:
* --bar-border has been changed to --bar-border-left
and --bar-border-right , which are used for customizing the style of bar border.
- --bar-border-left '' --bar-border-right '' can be used to disable the border
Features:
* Add ability to skip installing license with INSTALL_LICENSE option (CMake)
* Make it possible to shorten the theme and icons output (Theme / Icons)
* Support -l '?' to show a question mark (Logo)
* Add new module CPUCache to display CPU cache sizes (CPUCache)
* In ---format, {#keys} and {#title} can be used to reference the color of keys and title
* Improve speed of Guix package detection (Packages, Linux)
* Assume wm plugins are daemon processes to improve performance (WM, macOS)
Bugfixes:
* Remove shebangs from completions (#980)
* Fix white chars not visible in terminal of light theme (Logo)
* Normalize bright colors to fix color display in Apple Terminal (#991, Colors)
* Correctly capitalize GNOME (#997, DE, Linux)
* Fix segfault on system using turkish language (#995, InitSystem, Linux)
* Fix kubuntu detection (#1000, OS, Linux)
* Don't display duplicate entries (OS, Linux)