Disable Zstandard on Ubuntu 16.04

0.5.1 is too old. We can use 1.3.1 by enabling xenial-updates APT
line. But we don't use it until it's requested.

dev/tasks/linux-packages/apt/ubuntu-xenial/Dockerfile

@@ -61,7 +61,6 @@ RUN \
     libre2-dev \
     libsnappy-dev \
     libssl-dev \
-    libzstd-dev \
     lsb-release \
     pkg-config \
     protobuf-compiler \

dev/tasks/linux-packages/debian.ubuntu-xenial/control

@@ -26,7 +26,6 @@ Build-Depends:
   libre2-dev,
   libsnappy-dev,
   libssl-dev,
-  libzstd-dev,
   nvidia-cuda-toolkit [!arm64],
   pkg-config,
   protobuf-compiler,

dev/tasks/linux-packages/debian.ubuntu-xenial/rules

@@ -47,7 +47,6 @@ override_dh_auto_configure:
 	  -DARROW_WITH_LZ4=ON					\
 	  -DARROW_WITH_SNAPPY=ON				\
 	  -DARROW_WITH_ZLIB=ON					\
-	  -DARROW_WITH_ZSTD=ON					\
 	  -DCMAKE_BUILD_TYPE=$(BUILD_TYPE)			\
 	  -DPythonInterp_FIND_VERSION=ON			\
 	  -DPythonInterp_FIND_VERSION_MAJOR=3