Static file copy buffers reduced from 64k to 32k to work around

Static file copy buffers reduced from 64k to 32k to work around
bogus MallocDebug library assumptions (STR #1660)

backend/ipp.c:
    - main(): Reduce buffer size to 32768.

backend/lpd.c:
    - main(): Reduce buffer size to 32768.

cups/request.c:
    - cupsDoFileRequest(): Reduce buffer size to 32768.

scheduler/mime.c:
    - load_types(): Reduce line buffer size to 32768.

git-svn-id: svn+ssh://src.apple.com/svn/cups/cups.org/trunk@5495 7a7537e8-13f0-0310-91df-b6672ffda945