build: Use bundled namespace instead of the simple zstd one

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

Author: cosmo0920

CMakeLists.txt

@@ -602,17 +602,17 @@ if(FLB_PREFER_SYSTEM_LIB_ZSTD)
   find_package(ZSTD 1.4.8 QUIET)
   if(ZSTD_FOUND)
     set(LIBZSTD_FOUND TRUE)
-    set(LIBZSTD_LIBRARIES ZSTD::ZSTD)
+    set(LIBZSTD_LIBRARIES BUNDLED::ZSTD)
   else()
     find_package(PkgConfig)
     pkg_check_modules(LIBZSTD libzstd>=1.4.8)
     if(LIBZSTD_FOUND)
       include_directories(${LIBZSTD_INCLUDE_DIRS})
       link_directories(${LIBZSTD_LIBRARY_DIRS})
-      add_library(ZSTD::ZSTD INTERFACE IMPORTED)
-      set_property(TARGET ZSTD::ZSTD PROPERTY
+      add_library(BUNDLED::ZSTD INTERFACE IMPORTED)
+      set_property(TARGET BUNDLED::ZSTD PROPERTY
         INTERFACE_LINK_LIBRARIES "${LIBZSTD_LIBRARIES}")
-      set(LIBZSTD_LIBRARIES ZSTD::ZSTD)
+      set(LIBZSTD_LIBRARIES BUNDLED::ZSTD)
     endif()
   endif()
 endif()