Bug 914: fix compiler detection on windows (grafted from d0828c602f7a055cbe51459e936741b5ff8e414c)
Bug 914: fix compiler detection on windows
(grafted from d0828c602f7a055cbe51459e936741b5ff8e414c)

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