[compiler-rt] [rtsan] Restrict arches and disable android (PR #98268)

[Chris Apple via llvm-commits]

cjappl wrote:

1 Failure so far from the build bot. CC @davidtrevelyan , I'm disappearing for my trip very soon

> The Buildbot has detected a new failure on builder clang-aarch64-sve-vla while building compiler-rt.

```

BUILD FAILED: failed stage 1 checked (failure)

Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'RealtimeSanitizer-Unit :: ./Rtsan-aarch64-NoInstTest/failed_to_discover_tests_from_gtest' FAILED ********************

********************

```



https://github.com/llvm/llvm-project/pull/98268