message: libarchive: disable warnings
diff: @@ -712,6 +712,7 @@ def configure(cxx_toolkit = None,
  '--disable-xattr',
  'CPPFLAGS=-I%s/include -I%s/include' % (openssl_prefix_absolute,
  zlib_prefix_absolute),
  + 'CFLAGS=-w', # No warnings.
  'LDFLAGS=-L%s/lib -L%s/lib' % (openssl_prefix_absolute,
  zlib_prefix_absolute),
  '--without-bz2lib',
  