[libc] Clean up scudo integration test

[michaelrj-google]

The scudo integration test is built in a very odd way (see the cmake: https://github.com/llvm/llvm-project/blob/main/libc/test/integration/scudo/CMakeLists.txt#L5).

It's built as a standalone executable instead of a proper integration test because it predates the proper integration test framework. I'd like to move it to use the add_integration_test rule in cmake.

previously: #116895 #116979

[llvmbot]

@llvm/issue-subscribers-libc

Author: Michael Jones (michaelrj-google)

The scudo integration test is built in a very odd way (see the cmake: https://github.com/llvm/llvm-project/blob/main/libc/test/integration/scudo/CMakeLists.txt#L5).

It's built as a standalone executable instead of a proper integration test because it predates the proper integration test framework. I'd like to move it to use the add_integration_test rule in cmake.

previously: #116895 #116979