Clang 13: Fix build errors ...

... due to local variables only being written to (but never read).

Signed-off-by: Daniel Edwards <dev@danieledwards.de>

Code/Framework/AzCore/AzCore/Math/Matrix3x4.cpp

@@ -25,7 +25,7 @@ namespace AZ
 
         void Matrix3x4SetRowGeneric(Matrix3x4* thisPtr, ScriptDataContext& dc)
         {
-            bool rowIsSet = false;
+            [[maybe_unused]] bool rowIsSet = false;
             if (dc.GetNumArguments() >= 5)
             {
                 if (dc.IsNumber(0))
@@ -88,7 +88,7 @@ namespace AZ
 
         void Matrix3x4SetColumnGeneric(Matrix3x4* thisPtr, ScriptDataContext& dc)
         {
-            bool columnIsSet = false;
+            [[maybe_unused]] bool columnIsSet = false;
             if (dc.GetNumArguments() >= 4)
             {
                 if (dc.IsNumber(0))
@@ -133,7 +133,7 @@ namespace AZ
 
         void Matrix3x4SetTranslationGeneric(Matrix3x4* thisPtr, ScriptDataContext& dc)
         {
-            bool translationIsSet = false;
+            [[maybe_unused]] bool translationIsSet = false;
 
             if (dc.GetNumArguments() == 3 &&
                 dc.IsNumber(0) &&

Code/Framework/AzCore/AzCore/Math/Uuid.cpp

@@ -77,7 +77,7 @@ namespace AZ
 
         // check open brace
         char c = *current++;
-        bool has_open_brace = false;
+        [[maybe_unused]] bool has_open_brace = false;
         if (c == '{')
         {
             c = *current++;

Code/Framework/AzCore/AzCore/Name/NameDictionary.cpp

@@ -85,7 +85,7 @@ namespace AZ
 
     NameDictionary::~NameDictionary()
     {
-        bool leaksDetected = false;
+        [[maybe_unused]] bool leaksDetected = false;
 
         for (const auto& keyValue : m_dictionary)
         {