use FetchContent for zstd library

CompressSave/ZstdWrapC/CMakeLists.txt

@@ -5,13 +5,30 @@ project(zstdwrap)
 add_library(zstdwrap SHARED
   dllmain.c zstdwrap.c zstdwrap.h)
 
+include(FetchContent)
+
+set(ZSTD_BUILD_STATIC ON)
+set(ZSTD_BUILD_SHARED OFF)
+
+FetchContent_Declare(
+  zstd
+  DOWNLOAD_EXTRACT_TIMESTAMP ON
+  URL https://github.com/facebook/zstd/releases/download/v1.5.7/zstd-1.5.7.tar.gz
+  URL_HASH SHA256=eb33e51f49a15e023950cd7825ca74a4a2b43db8354825ac24fc1b7ee09e6fa3
+  SOURCE_SUBDIR build/cmake
+  EXCLUDE_FROM_ALL
+)
+
+FetchContent_MakeAvailable(zstd)
+
+target_include_directories(zstdwrap PRIVATE ${zstd_SOURCE_DIR}/lib)
 target_compile_definitions(zstdwrap PRIVATE ZSTDWRAP_EXPORTS ZSTDLIB_STATIC_API)
 if(MSVC)
   target_compile_options(zstdwrap PRIVATE /MT)
 else()
   target_link_options(zstdwrap PRIVATE -static)
 endif()
-target_link_libraries(zstdwrap PRIVATE zstd)
+target_link_libraries(zstdwrap PRIVATE libzstd_static)
 if(WIN32)
   set_target_properties(zstdwrap PROPERTIES PREFIX "")
 endif()