Revert "[llvm] cmake config groundwork to have ZSTD in LLVM"

This reverts commit adf1ffe and f07caf2
which seem to break upstream https://lab.llvm.org/buildbot/#/builders/109/builds/42253.

Author: PiJoules

compiler-rt/test/lit.common.cfg.py

@@ -217,7 +217,7 @@ def get_path_from_clang(args, allow_failure):
 
 if config.have_zlib == "1":
   config.available_features.add("zlib")
-
+  
 if config.have_zstd == "1":
   config.available_features.add("zstd")
 

llvm/lib/Support/CMakeLists.txt

@@ -25,10 +25,6 @@ if(LLVM_ENABLE_ZLIB)
   set(imported_libs ZLIB::ZLIB)
 endif()
 
-if(LLVM_ENABLE_ZSTD)
-  list(APPEND imported_libs zstd)
-endif()
-
 if( MSVC OR MINGW )
   # libuuid required for FOLDERID_Profile usage in lib/Support/Windows/Path.inc.
   # advapi32 required for CryptAcquireContextW in lib/Support/Windows/Path.inc.