Revert "Convert build scripts to CMake (#13427)"

This reverts commit 354df17d16.

scripts/build-boringssl.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -exo pipefail
+source $(dirname -- "${BASH_SOURCE[0]}")/env.sh
+
+cd $BUN_DEPS_DIR/boringssl
+mkdir -p build
+cd build
+
+cmake "${CMAKE_FLAGS[@]}" -GNinja ..
+ninja libcrypto.a libssl.a libdecrepit.a
+
+cp **/libcrypto.a $BUN_DEPS_OUT_DIR/libcrypto.a
+cp **/libssl.a $BUN_DEPS_OUT_DIR/libssl.a
+cp **/libdecrepit.a $BUN_DEPS_OUT_DIR/libdecrepit.a