[llvm] [compiler-rt] follow-up to 166837, rename COMPILER_RT_FORCE_TEST_BUILTINS_DIR to COMPILER_RT_TEST_BUILTINS_DIR (PR #171741)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-win-x-armv7l` running on `as-builder-1` while building `llvm` at step 8 "build-default".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/38/builds/6757

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 8 (build-default) failure: cmake (failure)
...
-- Configuring incomplete, errors occurred!
See also "C:/buildbot/as-builder-1/x-armv7l/build/runtimes/runtimes-armv7-unknown-linux-gnueabihf-bins/CMakeFiles/CMakeOutput.log".
See also "C:/buildbot/as-builder-1/x-armv7l/build/runtimes/runtimes-armv7-unknown-linux-gnueabihf-bins/CMakeFiles/CMakeError.log".
Batch file failed at line 3 with errorcode 1
.396 [11/3/5209]Creating directories for 'runtimes-armv7-unknown-linux-gnueabihf'
100.445 [10/3/5210]No download step for 'runtimes-armv7-unknown-linux-gnueabihf'
100.494 [9/3/5211]No update step for 'runtimes-armv7-unknown-linux-gnueabihf'
100.544 [8/3/5212]No patch step for 'runtimes-armv7-unknown-linux-gnueabihf'
100.544 [7/3/5212]Performing configure step for 'runtimes-armv7-unknown-linux-gnueabihf'
106.230 [3/2/5218]Linking CXX shared library bin\LLVM-C.dll
FAILED: runtimes/runtimes-armv7-unknown-linux-gnueabihf-stamps/runtimes-armv7-unknown-linux-gnueabihf-configure C:/buildbot/as-builder-1/x-armv7l/build/runtimes/runtimes-armv7-unknown-linux-gnueabihf-stamps/runtimes-armv7-unknown-linux-gnueabihf-configure 
runtimes\CMakeFiles\runtimes-armv7-unknown-linux-gnueabihf-configure-cb3980a.bat 84153951bb9f62a7
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/171741