netdata: update to version 1.33.1

netdata: update to version 1.33.1

- Switch to upstream's release tarball
  Requires to add PKG_BUILD_DIR since netdata is extracted to the folder
  netdata-v1.33.1 instead of the previous solution where there was
missing v

- Disable anomaly detection by default
This avoids adding a new dependencies to netdata

Fixes:
Package netdata is missing dependencies for the following libraries:
libatomic.so.1
libstdc++.so.6

- Add FreeBSD patch to have smaller package and to avoid clutter in
  WebUI

Signed-off-by: Michal Vasilek <michal.vasilek@nic.cz>
[add commit message, add FreeBSD patch]
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>