3rdparty libs in qt_lib_XXX.pri files are broken in Ninja Multi-Config build

cmake -G"Ninja Multi-Config" -DCMAKE_C_COMPILER=cl.exe -DCMAKE_CXX_COMPILER=cl.exe -DCMAKE_CONFIGURATION_TYPES="RelWithDebInfo;Debug" -DFEATURE_developer_build=ON -DBUILD_EXAMPLES=OFF -DBUILD_TESTING=OFF -DBUILD_WITH_PCH=OFF -DOPENSSL_ROOT_DIR="C:\Program Files\OpenSSL-Win64" C:\Users\jobor\dev\qt\dev\qtbase

breaks the NMC build, because we generate different content for qt_lib_network_private.pri for different configs. Happens because of the different debug/release openssl libs.