Fonts: bundle Liberation Sans and register it with fontconfig

- ship assets/LiberationSans-Regular.ttf (+ OFL license/README)
- at startup, resolve the .so path via dladdr, add assets/...ttf to the
  current fontconfig config with FcConfigAppFontAddFile, and fall back to
  the system Liberation path if the asset is missing
- font creation tries Liberation Sans, then DejaVu Sans/Noto/Tahoma/Verdana/
  Arial, so the overlay still renders on installs without the bundled font

1 files changed, 9 insertions, 0 deletions

diff --git a/assets/README.md b/assets/README.md
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+# Bundled font
+
+`LiberationSans-Regular.ttf` is the Liberation Sans regular face from the
+Liberation Fonts project (https://github.com/liberationfonts/liberation-fonts).
+
+Licensed under the SIL Open Font License 1.1; see `OFL.txt`.
+
+`hl2hake` registers this file with fontconfig at startup so the VGUI overlay
+does not depend on the host/game install having Liberation Sans installed.