Try to work around Linux FILE_OFFSET_64 brain damage.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5683 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvgz/zlib.h

@@ -1569,9 +1569,7 @@ ZEXTERN int ZEXPORT inflateBackInit_ OF((z_streamp strm, int windowBits,
    ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
    ZEXTERN uLong ZEXPORT adler32_combine64 OF((uLong, uLong, z_off64_t));
    ZEXTERN uLong ZEXPORT crc32_combine64 OF((uLong, uLong, z_off64_t));
-#endif
-
-#if !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
+#elif !defined(ZLIB_INTERNAL) && _FILE_OFFSET_BITS-0 == 64 && _LFS64_LARGEFILE-0
 #  define gzopen gzopen64
 #  define gzseek gzseek64
 #  define gztell gztell64