Change IOBUF_SIZE to 64K in decompress_bunzip2.c

[chazste]

In testing the resolution to issue #1422 in rufus, I/O performance is significantly worse when writing an image that in BZ compressed versus the straight uncompressed image. It seems that much of the performance loss is due to the [small] I/O buffer size.

Please change IOBUF_SIZE to 64K in decompress_bunzip2.c

[chazste]

I've now tested this change on a second workstation (i.e. my "work" workstation, where I regularly do Yocto builds and this is my intended workflow) and am seeing results very similar to writing the uncompressed image.

I agree with your sentiment that if this change is implicated in a later regression it should be backed out. OTOH I don't expect any downside on any machine that is capable of running rufus/windows.

[pbatard]

I will apply this request. But you have to understand that this is not a high priority. So please be patient, okay?