[runtimes] Avoid cluttering the top-level build directory with test artifacts (#112717)

Instead of placing artifacts for testing the runtimes at <build>/test,
place those artifacts at <build>/<project>/test. This prevents
cluttering the build directory with the runtimes' test artifacts for
everyone else.

As a drive-by, remove LIBCXX_BINARY_INCLUDE_DIR which wasn't used
anymore.

GitOrigin-RevId: 8c77f4c5087ac5a8e5dc08e472cf06897689a68b
1 file changed
tree: 3ce10a0473a61ac2eb64b9a8816d99515ac03e65
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt
  8. LICENSE.TXT