Update license-checker.cfg with simplified rules

`license-checker` has been updated to support `**` wildcards simplifying the ruless, and multiple license configs.

Add a new config for the bison generated files to ensure their licenses don't change.

license-checker.cfg

@@ -1,10 +1,19 @@
-{
+[
+    {
+        "licenses": [
+            "Apache-2.0-Header",
+            "BSD-2-Clause",
+            "BSD-3-Clause",
+            "MIT-0",
+            "MIT"
+        ],
         "paths": [
             {
                 "exclude": [
+                    "**.md",
+
                     "_config.yml",
                     ".*",
-                "*.md",
                     "CMakeSettings.json",
                     "known_good_khr.json",
                     "known_good.json",
@@ -13,29 +22,30 @@
                     "README-spirv-remap.txt",
                     "WORKSPACE",
 
-                "gtests/README.md",
-                "External/spirv-tools",
-                "Test/*",
-                "out/*",
-                "glslang/Include/revision.*",
                     "glslang/OSDependent/Web/glslang.*.js",
-
                     "glslang/MachineIndependent/glslang_tab.cpp",
                     "glslang/MachineIndependent/glslang_tab.cpp.h",
 
-                "**.md",
                     "build/**",
                     "out/**",
                     "Test/**",
                     "External/spirv-tools/**"
                 ]
             }
-    ],
-    "licenses": [
-        "Apache-2.0-Header",
-        "BSD-2-Clause",
-        "BSD-3-Clause",
-        "MIT-0",
-        "MIT"
         ]
-}
+    },
+    {
+        "licenses": [
+            "GPL-Header"
+        ],
+        "paths": [
+            { "exclude": [ "**" ] },
+            {
+                "include": [
+                    "glslang/MachineIndependent/glslang_tab.cpp",
+                    "glslang/MachineIndependent/glslang_tab.cpp.h"
+                ]
+            }
+        ]
+    }
+]