Use standard zlib in examples

This change updates the Sandboxed API examples to use the standard zlib library. For Bazel, this means depending on the `zlib` module from the Bazel Central Repository (v1.3.1). For CMake, it uses `FetchContent_MakeAvailable` with zlib v1.3.1.

The custom `zlib.BUILD` file and the `zlib.patch` are no longer necessary and have been removed. The patch was originally a workaround for a libclang issue with the `OF()` macro in older zlib versions, which is not present in zlib 1.3.1.

PiperOrigin-RevId: 805767594
Change-Id: Id068af6b10d54079fa00f5045da53e99fc47ed9e

Author: cblichmann

MODULE.bazel

@@ -33,6 +33,7 @@ bazel_dep(name = "rules_python", version = "1.0.0")
 bazel_dep(name = "rules_cc", version = "0.1.2")
 bazel_dep(name = "libunwind", version = "1.8.1")
 bazel_dep(name = "libffi", version = "3.4.7")
+bazel_dep(name = "zlib", version = "1.3.1.bcr.7")  # Only needed for examples
 
 # Non-Modularized Dependencies:
 
@@ -50,23 +51,3 @@ http_archive(
     strip_prefix = "libcap-2.27",
     urls = ["https://www.kernel.org/pub/linux/libs/security/linux-privs/libcap2/libcap-2.27.tar.gz"],
 )
-
-# zlib, only needed for examples
-http_archive(
-    name = "net_zlib",
-    build_file = "//sandboxed_api:bazel/external/zlib.BUILD",
-    patch_args = ["-p1"],
-    # This is a patch that removes the "OF" macro that is used in zlib function
-    # definitions. It is necessary, because libclang, the library used by the
-    # interface generator to parse C/C++ files contains a bug that manifests
-    # itself with macros like this.
-    # We are investigating better ways to avoid this issue. For most "normal"
-    # C and C++ headers, parsing just works.
-    patches = ["//sandboxed_api:bazel/external/zlib.patch"],
-    sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",  # 2020-04-23
-    strip_prefix = "zlib-1.2.11",
-    urls = [
-        "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
-        "https://www.zlib.net/zlib-1.2.11.tar.gz",
-    ],
-)

MODULE.bazel.lock

@@ -13,56 +13,11 @@
 # limitations under the License.
 
 FetchContent_Declare(zlib
-  URL      https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz
-  URL_HASH SHA256=c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
-  PATCH_COMMAND patch -p1
-                < "${SAPI_SOURCE_DIR}/sandboxed_api/bazel/external/zlib.patch"
+  URL      https://github.com/madler/zlib/releases/download/v1.3.1/zlib-1.3.1.tar.gz
+  URL_HASH SHA256=9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23
 )
-FetchContent_GetProperties(zlib)
-if(NOT zlib_POPULATED)
-  FetchContent_Populate(zlib)
-endif()
+FetchContent_MakeAvailable(zlib)
 
 set(ZLIB_FOUND TRUE)
 set(ZLIB_INCLUDE_DIRS ${zlib_SOURCE_DIR})
-
-add_library(z STATIC
-  ${zlib_SOURCE_DIR}/adler32.c
-  ${zlib_SOURCE_DIR}/compress.c
-  ${zlib_SOURCE_DIR}/crc32.c
-  ${zlib_SOURCE_DIR}/crc32.h
-  ${zlib_SOURCE_DIR}/deflate.c
-  ${zlib_SOURCE_DIR}/deflate.h
-  ${zlib_SOURCE_DIR}/gzclose.c
-  ${zlib_SOURCE_DIR}/gzguts.h
-  ${zlib_SOURCE_DIR}/gzlib.c
-  ${zlib_SOURCE_DIR}/gzread.c
-  ${zlib_SOURCE_DIR}/gzwrite.c
-  ${zlib_SOURCE_DIR}/infback.c
-  ${zlib_SOURCE_DIR}/inffast.c
-  ${zlib_SOURCE_DIR}/inffast.h
-  ${zlib_SOURCE_DIR}/inffixed.h
-  ${zlib_SOURCE_DIR}/inflate.c
-  ${zlib_SOURCE_DIR}/inflate.h
-  ${zlib_SOURCE_DIR}/inftrees.c
-  ${zlib_SOURCE_DIR}/inftrees.h
-  ${zlib_SOURCE_DIR}/trees.c
-  ${zlib_SOURCE_DIR}/trees.h
-  ${zlib_SOURCE_DIR}/uncompr.c
-  ${zlib_SOURCE_DIR}/zconf.h
-  ${zlib_SOURCE_DIR}/zlib.h
-  ${zlib_SOURCE_DIR}/zutil.c
-  ${zlib_SOURCE_DIR}/zutil.h
-)
-add_library(ZLIB::ZLIB ALIAS z)
-target_include_directories(z PUBLIC
-  ${zlib_SOURCE_DIR}
-)
-target_compile_options(z PRIVATE
-  -w
-  -Dverbose=-1
-)
-target_link_libraries(z PRIVATE
-  sapi::base
-)
-
+add_library(ZLIB::ZLIB ALIAS zlibstatic)