Address g++ compiler warnings, so we can move to g++14

Avoid uninitialized variable warnings on Linux/g++ by initializing translation_override in LLGLTFLoader.

Force the empty callback in LLPanelRegionTerrainInfo to decay to a function pointer to avoid warnings on Linux.

Remove initialization of mViewerObject in LLReflectionMap.h so that we are standards compliant.

(also paired with commit on fs-build-variables to ignore non-null warnings due to gcc stupidity)

indra/newview/gltf/llgltfloader.cpp

@@ -1460,7 +1460,7 @@ void LLGLTFLoader::buildOverrideMatrix(LLJointData& viewer_data, joints_data_map
             translated_joint = glm::inverse(parent_support_rest) * gltf_joint_rest_pose;
         }
 
-        glm::vec3 translation_override;
+        glm::vec3 translation_override(0.0f); // <FS:Beq/> Avoid uninitialized variable warning in gcc
         glm::vec3 skew;
         glm::vec3 scale;
         glm::vec4 perspective;

indra/newview/llfloaterregioninfo.cpp

@@ -2190,7 +2190,7 @@ void LLPanelRegionTerrainInfo::initMaterialCtrl(LLTextureCtrl*& ctrl, const std:
     if (!ctrl) return;
 
     // consume cancel events, otherwise they will trigger commit callbacks
-    ctrl->setOnCancelCallback([](LLUICtrl* ctrl, const LLSD& param) {});
+    ctrl->setOnCancelCallback(+[](LLUICtrl* ctrl, const LLSD& param) {}); // <FS:Beq/> force the empty callback to decay to a function pointer, which triggers warnings on gcc
     ctrl->setCommitCallback(
         [this, index](LLUICtrl* ctrl, const LLSD& param)
     {

indra/newview/llreflectionmap.h

@@ -131,7 +131,7 @@ public:
     LLSpatialGroup* mGroup = nullptr;
 
     // viewer object this probe is tracking (if any)
-    LLPointer<LLViewerObject> mViewerObject = nullptr;
+    LLPointer<LLViewerObject> mViewerObject; // <FS:Beq/> remove initialisation here, leave it to the pointer class and avoid issues 
 
     // what priority should this probe have (higher is higher priority)
     // currently only 0 or 1