bcompiler: minor patches

Hello! i propose some minor patches for bcompiler and one major change (i'll write about it later). minor patches are: 1) bz2_aware_stream_open() rewritten, so it can auto-detect not only bz2, but also gzip compressed streams and transparently handle them 2) bcompiler_compile_file() changled a little bit - first of all, there's an obvious bug: stream is set to NULL (when declaring), if file is included with unknown type, stream is not changed, so error is generated. for example, include_once [php 4.3.3] uses type 1, which isn't handled, so *any* include_once causes error. error should be generated only when stream is NULL upon return from bz2_aware_stream_open(); otherwise, fallback should be done to original zend_compile_file() 3) second, include_once() in php 4.3.3 uses type 1, which was not handled (while include uses type 0, which _was_ handled) - i've combined processing for types 0, 1 and 2 into single code fragment. it works ok. 4) third, i've allowed use_bz in bcompiler_compile_file() - it gives possibility to include() and require() bytecodes just as the plain php source (by the way, it much more convenient than fopen/bcompiler_load/fclose) 5) at last, php 4.3.3 on win32 crashes in bcompiler_load(). crash is caused by php_stream_close() call. i added #ifndef PHP_WIN32 around it (yes, i know - it's not correct, but it works w/o crash) i've written a message to Alan Knowles, but he didn't answer. i can post a patch (diff -u) here in order to review it /vk