ProjectExplorer: Fix CustomToolChain::operator==

We need to take the compiler command into account.

Fixes: QTCREATORBUG-30133
Change-Id: I5f120d4b3e41cbeeae255a2566332389d3eba508
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/customtoolchain.cpp

@@ -305,6 +305,7 @@ bool CustomToolChain::operator ==(const ToolChain &other) const
 
     auto customTc = static_cast<const CustomToolChain *>(&other);
     return m_makeCommand == customTc->m_makeCommand
+            && compilerCommand() == customTc->compilerCommand()
             && targetAbi() == customTc->targetAbi()
             && m_predefinedMacros == customTc->m_predefinedMacros
             && m_builtInHeaderPaths == customTc->m_builtInHeaderPaths;