[build] bzip2 default to not-enabled in build

./configure --with-bzip2 to enable

(autoconf build previously had bzip2 enabled by default, but bzip2
 already disabled by default in CMake, SCONS, and meson build configs)

configure.ac

@@ -955,7 +955,7 @@ AC_ARG_WITH([bzip2],
     [Enable bzip2 support for mod_compress]
   )],
   [WITH_BZIP2=$withval],
-  [WITH_BZIP2=yes]
+  [WITH_BZIP2=no]
 )
 AC_MSG_RESULT([$WITH_BZIP2])