Revert "[test-suite] Use CMAKE_C_COMPILER as TEST_SUITE_HOST_CC when compiling test-suite tools."

This reverts commit e736520bca4886486bb7babcd256a844377e2913.

Reverting as this causes failures seen in https://green.lab.llvm.org/green/job/lnt-ctmark-aarch64-O0-g/11207/.
diff --git a/cmake/modules/Host.cmake b/cmake/modules/Host.cmake
index 546acba..ef81dee 100644
--- a/cmake/modules/Host.cmake
+++ b/cmake/modules/Host.cmake
@@ -1,10 +1,4 @@
-set(_host_cc_default "cc")
-if (CMAKE_C_COMPILER_ID STREQUAL "Clang")
-  # If we are using Clang, we can use executable for the host even
-  # if CMake is configured to cross-compile.
-  set(_host_cc_default "${CMAKE_C_COMPILER}")
-endif ()
-set(TEST_SUITE_HOST_CC "${_host_cc_default}" CACHE STRING "C compiler targetting the host")
+set(TEST_SUITE_HOST_CC "cc" CACHE STRING "C compiler targetting the host")
 mark_as_advanced(TEST_SUITE_HOST_CC)
 
 function(llvm_add_host_executable targetname exename)