Bug#959991: joblib: build and install documentation

[Sandro Tosi]

Source: joblib
Severity: normal

Hello,
the upstream tarball contains the doc dir, so please build it and ship it in a
-doc package.  sphinx-gallery will benefit from it since it uses joblib
intersphinx data for its tests.

Thanks!

-- System Information:
Debian Release: 10.0
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (1, 'experimental-debug'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-5-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled