Fix github CI (#2477)

* Fix github CI

```
Checking lib/check.cpp: __CPPCHECK__=1...
lib/symboldatabase.h:719:5: warning: Class 'Function' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    Function(const Token *tokenDef);
    ^

Checking lib/templatesimplifier.cpp: __CPPCHECK__=1...
lib/symboldatabase.cpp:1754:33: warning: Condition 'settings' is always true [knownConditionTrueFalse]
    const Library * const lib = settings ? &settings->library : nullptr;
                                ^
lib/symboldatabase.cpp:1751:9: note: Assuming that condition '!settings' is not redundant
    if (!settings)
        ^
lib/symboldatabase.cpp:1754:33: note: Condition 'settings' is always true
    const Library * const lib = settings ? &settings->library : nullptr;
```

* Compile parseClangAstDump

lib/cppcheck.vcxproj

@@ -129,6 +129,7 @@
     <ClInclude Include="checkunusedfunctions.h" />
     <ClInclude Include="checkunusedvar.h" />
     <ClInclude Include="checkvaarg.h" />
+    <ClInclude Include="clangastdump.h" />
     <ClInclude Include="config.h" />
     <ClInclude Include="cppcheck.h" />
     <ClInclude Include="ctu.h" />
@@ -556,4 +557,4 @@ xcopy "$(SolutionDir)platforms" "$(OutDir)platforms" /E /I /D /Y</Command>
   </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets" />
-</Project>
+</Project>

lib/cppcheck.vcxproj.filters

@@ -167,6 +167,9 @@
     <ClCompile Include="programmemory.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="clangastdump.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="checkbufferoverrun.h">
@@ -325,6 +328,9 @@
     <ClInclude Include="ctu.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="clangastdump.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="version.rc" />
@@ -332,4 +338,4 @@
   <ItemGroup>
     <Natvis Include="cppcheck.natvis" />
   </ItemGroup>
-</Project>
+</Project>

lib/symboldatabase.cpp

@@ -1751,7 +1751,7 @@ void Variable::evaluate(const Settings* settings)
     if (!settings)
         return;
 
-    const Library * const lib = settings ? &settings->library : nullptr;
+    const Library * const lib = &settings->library;
 
     if (mNameToken)
         setFlag(fIsArray, arrayDimensions(settings));

lib/symboldatabase.h

@@ -716,7 +716,7 @@ public:
     enum Type { eConstructor, eCopyConstructor, eMoveConstructor, eOperatorEqual, eDestructor, eFunction, eLambda };
 
     Function(const Tokenizer *mTokenizer, const Token *tok, const Scope *scope, const Token *tokDef, const Token *tokArgDef);
-    Function(const Token *tokenDef);
+    explicit Function(const Token *tokenDef);
 
     const std::string &name() const {
         return tokenDef->str();