[runtimes] Remove dependencies on cxx_experimental for test-suite installs (#171678)

This patch removes explicit dependencies on cxx_experimental for
installations that are local to the test suite. Such dependencies
are not required anymore from the test-suite installation targets
since the proper dependency is now encoded between cxx and
cxx_experimental.

NOKEYCHECK=True
GitOrigin-RevId: 4ffd373e3853ebc00fb339611e215deab682a54c
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 4283821..2559ab3 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -15,7 +15,7 @@
 set(LIBUNWIND_TESTING_INSTALL_PREFIX "${LIBUNWIND_BINARY_DIR}/test-suite-install")
 set(libunwind_test_suite_install_targets unwind-headers unwind)
 if ("libcxx" IN_LIST LLVM_ENABLE_RUNTIMES)
-  list(APPEND libunwind_test_suite_install_targets cxx-headers cxx cxx_experimental cxx-modules cxxabi-headers cxxabi)
+  list(APPEND libunwind_test_suite_install_targets cxx-headers cxx cxx-modules cxxabi-headers cxxabi)
 endif()
 foreach(target IN LISTS libunwind_test_suite_install_targets)
   add_custom_target(libunwind-test-suite-install-${target} DEPENDS "${target}"