ProjectExplorer: Remove Run{Control,Configuration}::abi

Unused now, and arguably not a valid concept anymore.
A run control may consist of different runworkers,
'operating' on different systems.

Since the removed RunConfiguration::abi() implementation uses
only public Target ABI, user code could revive that locally
in case it was needed again.

Change-Id: I658c6e88b4a1aec18bf4de91fc86230552bc0710
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -310,17 +310,6 @@ QVariantMap RunConfiguration::toMap() const
     return map;
 }
 
-Abi RunConfiguration::abi() const
-{
-    BuildConfiguration *bc = target()->activeBuildConfiguration();
-    if (!bc)
-        return Abi::hostAbi();
-    ToolChain *tc = ToolChainKitInformation::toolChain(target()->kit(), Constants::CXX_LANGUAGE_ID);
-    if (!tc)
-        return Abi::hostAbi();
-    return tc->targetAbi();
-}
-
 BuildTargetInfo RunConfiguration::buildTargetInfo() const
 {
     return target()->applicationTargets().buildTargetInfo(m_buildKey);
@@ -1334,13 +1323,6 @@ Utils::Icon RunControl::icon() const
     return d->icon;
 }
 
-Abi RunControl::abi() const
-{
-    if (const RunConfiguration *rc = d->runConfiguration.data())
-        return rc->abi();
-    return Abi();
-}
-
 IDevice::ConstPtr RunControl::device() const
 {
    return d->device;