Merge pull request #448 from scribam/zstd-static

Use libzstd_shared only if BUILD_SHARED_LIBS is ON

Author: 0-wiz-0

CMakeLists.txt

@@ -243,7 +243,7 @@ if(ENABLE_ZSTD)
   find_package(zstd 1.3.6)
   if(zstd_FOUND)
     set(HAVE_LIBZSTD 1)
-    if(TARGET zstd::libzstd_shared)
+    if(TARGET zstd::libzstd_shared AND BUILD_SHARED_LIBS)
       set(zstd_TARGET zstd::libzstd_shared)
     else()
       set(zstd_TARGET zstd::libzstd_static)