Fix configuration of CUDA:  - preserve user defined CUDA_NVCC_FLAGS  - remove the -ansi flag that conflicts with -std=c++11  - do not add -std=c++11 if already there
Fix configuration of CUDA:
 - preserve user defined CUDA_NVCC_FLAGS
 - remove the -ansi flag that conflicts with -std=c++11
 - do not add -std=c++11 if already there

ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,pasuka/eigen,pasuka/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen