message: depends: zlib: Move toolchain options to configure
  zlib has its own custom configure script, see comment in zlib.mk for
  more details
diff: @@ -5,23 +5,26 @@ $(package)_file_name=$(package)-$($(package)_version).tar.gz
  $(package)_sha256_hash=c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
  define $(package)_set_vars
  -$(package)_build_opts= CC="$($(package)_cc)"
  -$(package)_build_opts+=CFLAGS="$($(package)_cflags) $($(package)_cppflags) -fPIC"
  -$(package)_build_opts+=RANLIB="$($(package)_ranlib)"
  -$(package)_build_opts+=AR="$($(package)_ar)"
  -$(package)_build_opts_darwin+=AR="$($(package)_libtool)"
  -$(package)_build_opts_darwin+=ARFLAGS="-o"
  +$(package)_config_opts= CC="$($(package)_cc)"
  +$(package)_config_opts+=CFLAGS="$($(package)_cflags) $($(package)_cppflags) -fPIC"
  +$(package)_config_opts+=RANLIB="$($(package)_ranlib)"
  +$(package)_config_opts+=AR="$($(package)_ar)"
  +$(package)_config_opts_darwin+=AR="$($(package)_libtool)"
  +$(package)_config_opts_darwin+=ARFLAGS="-o"
  endef
  +# zlib has its own custom configure script that takes in options like CC,
  +# CFLAGS, RANLIB, AR, and ARFLAGS from the environment rather than from
  +# command-line arguments.
  define $(package)_config_cmds
  - ./configure --static --prefix=$(host_prefix)
  + env $($(package)_config_opts) ./configure --static --prefix=$(host_prefix)
  endef
  define $(package)_build_cmds
  - $(MAKE) $($(package)_build_opts) libz.a
  + $(MAKE) libz.a
  endef
  define $(package)_stage_cmds
  - $(MAKE) DESTDIR=$($(package)_staging_dir) install $($(package)_build_opts)
  + $(MAKE) DESTDIR=$($(package)_staging_dir) install
  endef
  