ProjectExplorer: Remove ToolChain::canClone()

Was returning true in all cases.

Change-Id: Iafbafbf44a0b631b83e768c75f963e1bb7821a25
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

src/plugins/projectexplorer/msvctoolchain.cpp

@@ -1000,11 +1000,6 @@ std::unique_ptr<ToolChainConfigWidget> MsvcToolChain::createConfigurationWidget(
     return std::make_unique<MsvcToolChainConfigWidget>(this);
 }
 
-bool MsvcToolChain::canClone() const
-{
-    return true;
-}
-
 ToolChain *MsvcToolChain::clone() const
 {
     return new MsvcToolChain(*this);

src/plugins/projectexplorer/msvctoolchain.h

@@ -79,7 +79,6 @@ public:
 
     std::unique_ptr<ToolChainConfigWidget> createConfigurationWidget() override;
 
-    bool canClone() const override;
     ToolChain *clone() const override;
 
     MacroInspectionRunner createMacroInspectionRunner() const override;

src/plugins/projectexplorer/toolchain.cpp

@@ -197,11 +197,6 @@ Core::Id ToolChain::language() const
     return d->m_language;
 }
 
-bool ToolChain::canClone() const
-{
-    return true;
-}
-
 bool ToolChain::operator == (const ToolChain &tc) const
 {
     if (this == &tc)

src/plugins/projectexplorer/toolchain.h

@@ -146,7 +146,6 @@ public:
     virtual bool operator ==(const ToolChain &) const;
 
     virtual std::unique_ptr<ToolChainConfigWidget> createConfigurationWidget() = 0;
-    virtual bool canClone() const;
     virtual ToolChain *clone() const = 0;
 
     // Used by the toolchainmanager to save user-generated tool chains.

src/plugins/projectexplorer/toolchainoptionspage.cpp

@@ -543,7 +543,7 @@ void ToolChainOptionsWidget::updateState()
     bool canDelete = false;
     if (ToolChainTreeItem *item = currentTreeItem()) {
         ToolChain *tc = item->toolChain;
-        canCopy = tc->isValid() && tc->canClone();
+        canCopy = tc->isValid();
         canDelete = tc->detection() != ToolChain::AutoDetection;
     }