Fix missing zstd include/link deps in Common and basis_universal

Common and basis_universal call zstd functions directly but never
declared the dependency after being split into their own
CMakeLists.txt files, relying on directory-scope include_directories()
that no longer reached them. Worked on Linux via system zstd.h, but
broke the Android NDK build which has no such fallback.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01XMv4XdM5dThs9Avr5FPXRv

Common/CMakeLists.txt

@@ -382,6 +382,14 @@ endif()
 
 target_link_libraries(Common ${LIBZIP_LIBRARY} 7zip ${PNG_LIBRARIES} basis_universal ${ZLIB_LIBRARY} pugixml vma gason udis86 ${RT_LIB} ${ATOMIC_LIB})
 
+# ZIMLoad.cpp/ZIMSave.cpp, Serializer.cpp, and Render/TextureAtlas.cpp call directly into zstd.
+if(USE_SYSTEM_ZSTD)
+	target_include_directories(Common PRIVATE ${ZSTD_INCLUDE_DIR})
+	target_link_libraries(Common ${ZSTD_LIBRARY})
+else()
+	target_link_libraries(Common libzstd_static)
+endif()
+
 # Common/GPU/ShaderTranslation.cpp and Common/GPU/Vulkan/VulkanContext.cpp call directly into
 # glslang/spirv-cross, so Common needs to declare this dependency itself rather than relying on
 # some downstream consumer happening to also link it (that was the previous, fragile setup: this

ext/basis_universal/CMakeLists.txt

@@ -18,3 +18,11 @@ add_library(basis_universal STATIC
 	basisu_transcoder_tables_pvrtc2_alpha_33.inc
 	basisu_transcoder_uastc.h
 )
+
+# basisu_transcoder.cpp calls ZSTD_decompress()/ZSTD_isError() directly for KTX2 supercompression.
+if(USE_SYSTEM_ZSTD)
+	target_include_directories(basis_universal PRIVATE ${ZSTD_INCLUDE_DIR})
+	target_link_libraries(basis_universal ${ZSTD_LIBRARY})
+else()
+	target_link_libraries(basis_universal libzstd_static)
+endif()