Keep .syso files

f12b881 (HEAD -> master, origin/master, origin/HEAD) Consider '.syso' as a Go file for vendoring
67927bd cleanVCS: prevent panic

Fix for whitelisted packages on full vendor cycle.

respect --whitelist options when doing a full vendor cycle

Commit b1caa0025ab0717d0d75c395dbc25825b739d48c added a `--whitelist`
flag to allow ignoring paths in the vendor directory when cleaning up
unused packages/files.

However, 4b11a0f89b18b2d4360f4b725fb5045308522a98 added an optimization
to clean the whole vendor directory when doing a full vendor cycle.
Unfortunately, that change did not take the `--whitelist` option into
account, resulting in whitelisted packages/files to be deleted when doing
a full vendor cycle.

This patch checks if a whitelist option is set when doing a full vendor
cycle, and if so, ignores the specified paths when cleaning.

Using the "v18.06.0-ce" branch on github.com/docker/engine, which has a custom `archive/tar` package in the vendor directory;

    $ git checkout v18.06.0-ce
    $ vndr --whitelist 'archive/tar/.*'
    2020/01/20 18:50:51 Collecting initial packages
    2020/01/20 18:50:52 Download dependencies
    2020/01/20 18:50:55 Starting whole vndr cycle because no package specified
    2020/01/20 18:50:55 Ignoring paths matching "archive/tar/.*"
    ...
    020/01/20 18:53:46  Finished clone github.com/aws/aws-sdk-go
    2020/01/20 18:53:46 Finished clone github.com/hashicorp/consul
    2020/01/20 18:53:46 Dependencies downloaded. Download time: 2m50.469326342s
    2020/01/20 18:53:46 Collecting all dependencies
    2020/01/20 18:53:57 Clean vendor dir from unused packages
    2020/01/20 18:53:57 Ignoring paths matching "archive/tar/.*"
    2020/01/20 18:53:59 Success
    2020/01/20 18:53:59 Running time: 3m7.731082301s

After vendoring completed, verify that the `archive/tar` directory was kept:

    ls vendor/archive/tar
    LICENSE         README.md       common.go       format.go       reader.go       stat_actime1.go stat_actime2.go stat_unix.go    strconv.go      writer.go

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Support for versioned imports

d385c05

Riscv64 suport and bitbucket fix

Minore relase with riscv64 support and fixes

146dcc3 migrate bitbucket to api 2.0
f5ab8fc add riscv64 support
fc96218 Add more clear messages around clone failures

Catch some updates

• Keep "go.mod" for reference
• combine param types and replace if-else with switch
• preserve directories with .c files
• Retry clone