Add a .clangd file to aid lsp.

rsmarples · rsmarples · commit 593c0a335341 · 2025-09-30T09:43:04.000+01:00
diff --git a/.clangd b/.clangd
@@ -0,0 +1,4 @@
+If:
+  PathMatch: src/.*\.c
+CompileFlags:
+  Add: [-I., -I.., -I../compat]
