Revert "[PATCH] offload-tunnel-cmake with proper escape" (#161727)

Reverts #161552

Author: ronlieb

llvm/runtimes/CMakeLists.txt

@@ -507,14 +507,10 @@ if(build_runtimes)
   endif()
 
   # Forward user-provived system configuration to runtimes for requirement introspection.
-  # CMAKE_PREFIX_PATH is the search path for CMake packages. In order to pass through
-  # the command line interface, the CMake semicolon separator needs to be replaced
-  # with $<SEMICOLON>
+  # CMAKE_PREFIX_PATH is the search path for CMake packages.
   if(CMAKE_PREFIX_PATH)
-    string(JOIN "$<SEMICOLON>" escaped_cmake_prefix_path ${CMAKE_PREFIX_PATH})
-    list(APPEND extra_cmake_args "-DCMAKE_PREFIX_PATH=${escaped_cmake_prefix_path}")
+    list(APPEND extra_cmake_args "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}")
   endif()
-
   # CMAKE_PROGRAM_PATH is the search path for executables such as python.
   if(CMAKE_PROGRAM_PATH)
     list(APPEND extra_cmake_args "-DCMAKE_PROGRAM_PATH=${CMAKE_PROGRAM_PATH}")