.vscode/c_cpp_properties.json: Add marl include path

Fixes squiggles on marl includes.

Bug: b/140546382
Change-Id: If08700e453cade53d65926fc79eae09e6b19f05a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/36069
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>

.vscode/c_cpp_properties.json

diff --git a/.vscode/c_cpp_properties.json b/.vscode/c_cpp_properties.json
index 1e9ed6e..656379e 100644
--- a/.vscode/c_cpp_properties.json
+++ b/.vscode/c_cpp_properties.json
@@ -9,6 +9,7 @@
             "includePath": [
                 "${workspaceFolder}/src",
                 "${workspaceFolder}/include",
+                "${workspaceFolder}/third_party/marl/include",
                 "${workspaceFolder}/third_party/SPIRV-Headers/include",
                 "${workspaceFolder}/third_party/llvm-7.0/llvm/include",
                 "${workspaceFolder}/third_party/llvm-7.0/configs/common/include",
@@ -26,6 +27,7 @@
             "includePath": [
                 "${workspaceFolder}/src",
                 "${workspaceFolder}/include",
+                "${workspaceFolder}/third_party/marl/include",
                 "${workspaceFolder}/third_party/SPIRV-Headers/include",
                 "${workspaceFolder}/third_party/llvm-7.0/llvm/include",
                 "${workspaceFolder}/third_party/llvm-7.0/configs/common/include",
@@ -43,6 +45,7 @@
             "includePath": [
                 "${workspaceFolder}/src",
                 "${workspaceFolder}/include",
+                "${workspaceFolder}/third_party/marl/include",
                 "${workspaceFolder}/third_party/SPIRV-Headers/include",
                 "${workspaceFolder}/third_party/llvm-7.0/llvm/include",
                 "${workspaceFolder}/third_party/llvm-7.0/configs/common/include",