checknupdate: make it more reliable
cdn seems to update slower these days and checksum is likely to fail due
to no file when feed update observed
Auto Update: 6.4.5 -> 6.4.6
Auto Update: 6.4.4 -> 6.4.5
remove failed clr patches, sync with clr
Auto Update: 6.4.3 -> 6.4.4
Auto Update: 6.4.2 -> 6.4.3
Auto Update: 6.4.1 -> 6.4.2
Auto Update: 6.4.0 -> 6.4.1
Auto Update: 6.3.8 -> 6.3.9
Auto Update: 6.3.7 -> 6.3.8
Auto Update: 6.3.6 -> 6.3.7
Auto Update: 6.3.5 -> 6.3.6
Auto Update: 6.3.4 -> 6.3.5
Auto Update: 6.3.3 -> 6.3.4
Auto Update: 6.3.2 -> 6.3.3
Auto Update: 6.3.1 -> 6.3.2
Auto Update: 6.3.0 -> 6.3.1