butler v0.4.5 on windows/amd64: test-brotli is broken

[fasterthanlime]

Crashed on me:

amos at bowser in ~/tmp
$ ./butler test-brotli butler.exe
2015/11/12 00:25:54 Read file in 8.8166ms
2015/11/12 00:25:54 Uncompressed size is 10 MB
2015/11/12 00:25:54 Compressed (q= 0 ) to 3.0 MB in 181.652ms
2015/11/12 00:25:54 Decompressed in 58.6035ms
2015/11/12 00:25:54 Compressed (q= 1 ) to 3.0 MB in 190.4956ms
2015/11/12 00:25:54 Decompressed in 64.4563ms
2015/11/12 00:25:55 Compressed (q= 2 ) to 3.0 MB in 219.7675ms
2015/11/12 00:25:55 Decompressed in 51.7679ms
2015/11/12 00:25:55 Compressed (q= 3 ) to 3.1 MB in 239.3019ms
2015/11/12 00:25:55 Decompressed in 48.8384ms

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
Assertion failed!

Program: C:\msys64\home\amos\tmp\butler.exe
File: /home/travis/gopath/src/github.com/kothar/brotli-go/enc/./write_bits.h, Line 52

Expression: bits < 1UL << n_bits

[fasterthanlime]

Note that ./butler test-brotli works fine on either of the .dll files supplied in the .7z archive, or on the .7z archive itself.

[fasterthanlime]

Wild hold off until upstream issue is closed & we can get rid of our brotli-go fork to close that issue