Convert build scripts to CMake (#13427)

scripts/build-lshpack.sh

@@ -1,20 +0,0 @@
-#!/usr/bin/env bash
-set -exo pipefail
-source $(dirname -- "${BASH_SOURCE[0]}")/env.sh
-
-rm -rf CMakeFiles CMakeCache build.ninja
-mkdir -p $BUN_DEPS_OUT_DIR
-
-cd $BUN_DEPS_DIR/ls-hpack
-
-rm -rf CMakeCache* CMakeFiles
-
-cmake "${CMAKE_FLAGS[@]}" . \
-    -DCMAKE_BUILD_TYPE=Release \
-    -DLSHPACK_XXH=ON \
-    -DSHARED=0 \
-    -GNinja
-
-ninja libls-hpack.a
-
-cp ./libls-hpack.a $BUN_DEPS_OUT_DIR/liblshpack.a