build zstd in static to avoid DLL dependency on Windows

Summary: It seems after updating zstd to 1.4.5. `Dllexport` for zstd.dll was not being picked up correctly. Instead of having zstd being a runtime dependency let's try statically link it to avoid the DLL issue.

Reviewed By: vitaut

Differential Revision: D23970349

fbshipit-source-id: 3b14dddb64d410cb9546c416f27d73b7604b21ba

Author: fanzeyi

build/fbcode_builder/manifests/zstd

@@ -23,3 +23,6 @@ subdir = zstd-1.4.5/build/cmake
 # term solution for this is just to link static on macos.
 [cmake.defines.os=darwin]
 ZSTD_BUILD_SHARED = OFF
+
+[cmake.defines.os=windows]
+ZSTD_BUILD_SHARED = OFF