[CI] Fix cpp docker image

[asfimport]

make -f Makefile.docker run-cpp
...
54/64 Test #79: arrow-dataset-file_test ............***Failed    0.04 sec
Running arrow-dataset-file_test, redirecting output into /build/cpp/build/test-logs/arrow-dataset-file_test.txt (attempt 1/1)
/build/cpp/debug/arrow-dataset-file_test: error while loading shared libraries: libbrotlienc.so.1: cannot open shared object file: No such file or directory
/build/cpp/src/arrow/dataset

      Start 80: arrow-flight-test
55/64 Test #80: arrow-flight-test ..................***Failed    0.04 sec
Running arrow-flight-test, redirecting output into /build/cpp/build/test-logs/arrow-flight-test.txt (attempt 1/1)
/build/cpp/debug/arrow-flight-t

Reporter: Francois Saint-Jacques / @fsaintjacques
Assignee: Francois Saint-Jacques / @fsaintjacques

Related issues:

• [C++] CMake 3.2 build is broken (duplicates)

PRs and other links:

• GitHub Pull Request #4635

_{Note: This issue was originally created as ARROW-5653. Please see the migration documentation for further details.}

[asfimport]

Francois Saint-Jacques / @fsaintjacques:
I suspect this is related to ARROW-5202, after commenting the ninja install, the protobuf error goes away.

[asfimport]

Todd Farmer / @toddfarmer:
Transitioning issue from Resolved to Closed to based on resolution field value.