zstd: make zstd::libzstd point to shared library instead of static one.

In https://github.com/facebook/zstd/blob/v1.5.6/build/cmake/lib/CMakeLists.txt#L174
zstd::libzstd point to shared library when `-DBUILD_SHARED_LIBS=ON` otherwise It points to static library.

mingw-w64-zstd/PKGBUILD

@@ -4,15 +4,16 @@ _realname=zstd
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=1.5.6
-pkgrel=1
+pkgrel=2
 pkgdesc="Zstandard - Fast real-time compression algorithm (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32' 'clangarm64')
 url='https://facebook.github.io/zstd/'
+msys2_repository_url="https://github.com/facebook/zstd"
 msys2_references=(
   "cpe: cpe:/a:facebook:zstandard"
 )
-license=('BSD')
+license=('spdx:BSD-3-Clause OR GPL-2.0-or-later')
 depends=("${MINGW_PACKAGE_PREFIX}-gcc-libs")
 makedepends=("${MINGW_PACKAGE_PREFIX}-cc"
              "${MINGW_PACKAGE_PREFIX}-cmake"
@@ -45,6 +46,7 @@ build() {
     ${MINGW_PREFIX}/bin/cmake \
       -GNinja \
       -DCMAKE_INSTALL_PREFIX=${MINGW_PREFIX} \
+      -DBUILD_SHARED_LIBS=ON \
       "${extra_config[@]}" \
       -DZSTD_BUILD_CONTRIB=ON \
       -DBUILD_TESTING=OFF \