hides the scary files in examples/nvexec from clangd

clangd is crashy when processing the maxwell files in examples/nvexec, so tell clangd to skip them.

Author: ericniebler

.clangd

@@ -1,11 +1,5 @@
 # https://clangd.llvm.org/config
 
-# Apply a config conditionally to all C files
-If:
-  PathMatch: .*\.(c|h)$
-
----
-
 # Apply a config conditionally to all C++ files except those in the
 # include/execpools directory which need platform-dependent headers
 If:
@@ -17,10 +11,11 @@ If:
 # Apply a config conditionally to all CUDA files
 If:
   PathMatch: .*\.cuh?$
+  PathExclude: examples/nvexec/.*
 CompileFlags:
   Add:
     # Allow variadic CUDA functions
-    - "-Xclang=-fcuda-allow-variadic-functions"
+    - "-fcuda-allow-variadic-functions"
 
 ---
 
@@ -35,14 +30,15 @@ CompileFlags:
 
 # Use clang++ in CUDA mode to provide intellisense for files with `nvexec` in their path
 If:
-  PathMatch: (include|examples|test)/nvexec.*
+  PathMatch: [include/nvexec/.*, test/nvexec/.*]
 CompileFlags:
   Compiler: clang++
   Add:
     - "-x"
     - "cuda"
     - "-std=gnu++20"
     - "-Wno-unknown-cuda-version"
+    - "--cuda-host-only"
 
 ---