Remove unused zstd and zlib link dependencies

Neither zstd nor zlib headers are included or called anywhere in the
source. CCOB decompression is handled by clang-offload-bundler, not
by KernelDB directly. Removes the libzstd-dev and zlib build
requirements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: mawad-amd

src/CMakeLists.txt

@@ -62,8 +62,6 @@ target_link_libraries(
     stdc++
     stdc++fs
     amd_comgr
-    z
-    zstd
     dwarf
     elf
 )