Merge pull request #8817 from Tilka/cmake

CMake: support using system-wide zstd library

CMakeLists.txt

@@ -608,7 +608,7 @@ else()
   add_subdirectory(Externals/liblzma)
 endif()
 
-find_package(zstd)
+pkg_search_module(ZSTD QUIET libzstd)
 if(ZSTD_FOUND)
   message(STATUS "Using shared zstd")
 else()

Externals/zstd/CMakeLists.txt

@@ -1,4 +1,4 @@
-project(bzip2 C)
+project(zstd C)
 
 include(CheckTypeSize)
 include(CheckFunctionExists)