Remove CMake string REPEAT (#9771)
Remove CMake string REPEAT (#9771)

According to https://cmake.org/cmake/help/latest/command/string.html#repeat this was added in 3.15, we can revert this if we ever use a minimum cmake newer than that. Until then we should just remove the alternate path to reduce complexity.

Co-authored-by: driazati <d4a88e6bfb8aaeeaf240b84a2d19cb6109e58027@users.noreply.github.com>
Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,dmlc/tvm,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1