CMake: Fix missing path to Ninja from Qt installers

In the configure environment for MSVC toolchains.
The MSVC toolchain actually overwrites the PATH environment (triggered
via kit()->addToBuildEnvironment(result)), which it shouldn't.
But this is a minimal fix for Qt Creator 9.0 that also is in line with
what BuildConfiguration::baseEnvironment() does.

Fixes: QTCREATORBUG-28685
Change-Id: I0cb8e3c84419403672175bd581c16d90902e23ba
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -2168,8 +2168,8 @@ Environment CMakeBuildConfiguration::baseConfigureEnvironment() const
         ProjectExplorer::IDevice::ConstPtr devicePtr = BuildDeviceKitAspect::device(kit());
         result = devicePtr ? devicePtr->systemEnvironment() : Environment::systemEnvironment();
     }
-    addToEnvironment(result);
     kit()->addToBuildEnvironment(result);
+    addToEnvironment(result);
     result.modify(project()->additionalEnvironment());
     return result;
 }