Bug 775: propagate generator when workingaround cmake bug 9220
Bug 775: propagate generator when workingaround cmake bug 9220

pasuka/eigen,pasuka/eigen,pasuka/eigen,ritsu1228/eigen,TSC21/Eigen,TSC21/Eigen,toastedcrumpets/eigen,toastedcrumpets/eigen,pasuka/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,Zefz/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen,TSC21/Eigen,TSC21/Eigen,ritsu1228/eigen,Zefz/eigen,toastedcrumpets/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,Zefz/eigen,ROCmSoftwarePlatform/hipeigen