llvm: Do not use cmake infra to detect libzstd

OE's version is build using plain make not cmake as a result we do not
have the cmake support files and this probing method can get this info
from build host and force linking with libzstd from /usr/lib which is
not what we want when cross building.

Fixes errors building llvm-config like
/usr/lib/libzstd.so.1.5.2: error adding symbols: file in wrong
format
| clang-15: error: linker command failed with exit code 1 (use -v to see invocation)
| ninja: build stopped: subcommand failed.

Upstream-Status: Inappropriate [OE-Specific]
Signed-off-by: Khem Raj <[email protected]>

Author: kraj

llvm/lib/Support/CMakeLists.txt

@@ -22,7 +22,7 @@ if (HAS_WERROR_GLOBAL_CTORS)
 endif()
 
 if(LLVM_ENABLE_ZLIB)
-  list(APPEND imported_libs ZLIB::ZLIB)
+  list(APPEND imported_libs z)
 endif()
 
 if(LLVM_ENABLE_ZSTD)
@@ -34,7 +34,7 @@ if(LLVM_ENABLE_ZSTD)
 endif()
 
 if(LLVM_ENABLE_ZSTD)
-  list(APPEND imported_libs ${zstd_target})
+  list(APPEND imported_libs zstd)
 endif()
 
 if( WIN32 )
@@ -350,7 +350,7 @@ if(LLVM_ENABLE_ZLIB)
     get_property(zlib_library TARGET ZLIB::ZLIB PROPERTY LOCATION)
   endif()
   get_library_name(${zlib_library} zlib_library)
-  set(llvm_system_libs ${llvm_system_libs} "${zlib_library}")
+  set(llvm_system_libs ${llvm_system_libs} z)
 endif()
 
 if(LLVM_ENABLE_ZSTD)
@@ -364,7 +364,7 @@ if(LLVM_ENABLE_ZSTD)
   endif()
   if (zstd_target STREQUAL zstd::libzstd_shared)
     get_library_name(${zstd_library} zstd_library)
-    set(llvm_system_libs ${llvm_system_libs} "${zstd_library}")
+    set(llvm_system_libs ${llvm_system_libs} zstd)
   else()
     set(llvm_system_libs ${llvm_system_libs} "${zstd_STATIC_LIBRARY}")
   endif()