Merge #11442: [Docs] Update OpenBSD Build Instructions for OpenBSD 6.2

9d30f54 [Docs] Update OpenBSD Build Instructions for OpenBSD 6.2 (fanquake)

Pull request description:

  This updates the OpenBSD build docs to reflect building [master](8ddf60db7ad636b6a31b590251c671ded635fa1d) on a OpenBSD 6.2 VM (using VirtualBox 5.1.28 r117968 on macOS 10.12.6).

  Versions of installed packages were:
  ```
  gmake 4.2.1
  g++ 4.9.4
  git 2.12.2
  libevent 2.0.22
  libtool 2.4.2
  autoconf 2.69p2
  automake 1.15p0
  python 3.6.0
  boost 1.58.0p3
  llvm 4.0.0p2
  ```

  The boost package installed via pkg_add now seems to work correctly. So we shouldn't require manual building + patching.
  I also wasn't required to make adjustments to any resource limits.

  Building with g++ and Clang was successful, using:
  ```
  ./configure --disable-wallet --with-gui=no CC=egcc CXX=eg++ CPP=ecpp
  ```
  and
  ```
  ./configure --disable-wallet --with-gui=no CC=clang CXX=clang++
  ```

  Running ``` make check ``` worked for ```test/test_bitcoin``` but ```test/util/bitcoin-util-test.py``` failed with:
  ```
  Running test/util/bitcoin-util-test.py...
  ../test/util/bitcoin-util-test.py
  env: python3: No such file or directory
  ```
  So that seems like a configuration issue, Python 3.6 is installed.

  Still todo:
  - [ ] Check if a manual installation of Berkeley DB is required
  - [x] Fix running ```test/util/bitcoin-util-test.py```
  - [x] Have someone else verify building

  cc @laanwj

Tree-SHA512: 34b176de4865b36dab9d66e74a15c37152e4b6c9784152c30dabbb515d6d9ae9cdbdc7a7b4d777876f91269a6a78cc277ec87775fc6c17dd509f7cf46e89a2b3

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