Remove USE flag X for most packages.

portage/package.use

@@ -7,7 +7,6 @@ app-admin/keepassxc					autotype yubikey -network
 app-crypt/gcr						gtk
 app-text/poppler					cairo
 app-text/xmlto						text
-dev-cpp/gtkmm						X
 dev-lang/rust						verify-sig
 dev-libs/libedit					static-libs
 dev-libs/libpcre					-readline
@@ -18,10 +17,7 @@ dev-qt/qtgui						egl eglfs jpeg X
 gui-apps/grim						jpeg
 gui-apps/waybar						mpd network -popups -sndio -tray
 gui-apps/wofi						drun run -dmenu
-gui-libs/wlroots					X
 gui-wm/sway							man swaybg swayidle swaylock swaymsg X -swaybar
-kde-frameworks/knotifications		X
-kde-frameworks/kwindowsystem		X
 media-fonts/noto					cjk
 media-libs/babl						lcms introspection
 media-libs/freeimage				jpeg jpeg2k png raw tiff webp
@@ -59,10 +55,4 @@ sys-libs/llvm-libunwind				static-libs
 sys-libs/ncurses					static-libs
 sys-libs/zlib						minizip
 www-client/highway					lto proprietary-codecs system-allocator system-harfbuzz system-icu system-png vaapi -hangouts -js-type-check -libcxx -suid -X
-x11-base/xwayland					xcsecurity
-x11-libs/cairo						X
-x11-libs/gtk+						X
 x11-libs/libdrm						video_cards_radeon
-x11-libs/libva						X
-x11-libs/libxkbcommon				X
-x11-libs/pango						X