McuSupport: Enable and preselect usage of the shipped JOM (on Windows)

- Set CMake generator to "NMake Makefiles JOM"
- Add ICore::libexecPath to environment path
- Set the environment for the run configuration

Change-Id: Ie7b2dc1513b366911b429d77cc4a1954be531075
Reviewed-by: Aurindam Jana <aurindam.jana@qt.io>

src/plugins/mcusupport/mcusupportoptions.cpp

@@ -455,10 +455,10 @@ static void setKitEnvironment(ProjectExplorer::Kit *k, const BoardOptions* board
             changes.append({package->environmentVariableName(),
                             QDir::toNativeSeparators(package->path())});
     }
-    if (!pathAdditions.isEmpty()) {
     pathAdditions.append("${Path}");
+    if (Utils::HostOsInfo::isWindowsHost())
+        pathAdditions.append(QDir::toNativeSeparators(Core::ICore::libexecPath())); // for jom
     changes.append({"Path", pathAdditions.join(Utils::HostOsInfo::pathListSeparator())});
-    }
     EnvironmentKitAspect::setEnvironmentChanges(k, changes);
 }
 
@@ -471,6 +471,8 @@ static void setKitCMakeOptions(ProjectExplorer::Kit *k, const BoardOptions* boar
                                   ("%{CurrentBuild:Env:Qul_DIR}/" +
                                    board->toolChainFile()).toUtf8()));
     CMakeConfigurationKitAspect::setConfiguration(k, config);
+    if (Utils::HostOsInfo::isWindowsHost())
+        CMakeGeneratorKitAspect::setGenerator(k, "NMake Makefiles JOM");
 }
 
 ProjectExplorer::Kit *McuSupportOptions::kit(const BoardOptions* board)

src/plugins/mcusupport/mcusupportrunconfiguration.cpp

@@ -94,6 +94,7 @@ public:
             r.workingDirectory =
                     target->activeBuildConfiguration()->buildDirectory().toUserOutput();
             r.setCommandLine(cmd);
+            r.environment = target->activeBuildConfiguration()->environment();
             SimpleTargetRunner::doStart(r, {});
         });
     }