Highlight .inc files as .c files (#8496)

.vscode/settings.json

@@ -11,6 +11,7 @@
     "files.associations": {
       "*.h": "c",
       "*.c": "c",
+      "*.inc": "c",
       "*.cpp": "cpp",
       "*.hpp": "cpp",
       "xstddef": "c",