sysutils/backuppc, sysutils/backuppc4: Add GitHub to MASTER_SITES

[dbaio]

Summary

sysutils/backuppc, sysutils/backuppc4: Add GitHub to MASTER_SITES

Not using the Github framework on purpose for getting the same release file
hosted on Github and Sourceforge.

PR:	219653
Submitted by:	Alexander Moisseev <[e-mail]> (maintainer)
Approved by:	garga (mentor)
Differential Revision:	https://reviews.freebsd.org/D11046

Test Plan

sysutils/backuppc

$ portlint -C
WARN: Makefile: possible use of absolute pathname "/var/db/BackupPC".
WARN: /usr/home/dbaio/FreeBSD/ports_head/sysutils/backuppc/distinfo: [1]: TIMESTAMP is over 30 days old
WARN: /usr/home/dbaio/FreeBSD/ports_head/sysutils/backuppc/files/patch-update.pl: patch was not generated using ``make makepatch''.  It is recommended to use ``make makepatch'' when you need to [re-]generate a patch to ensure proper patch format.
0 fatal errors and 3 warnings found.

$ make fetch
===>  License GPLv2 accepted by the user
===>   backuppc-3.3.2_2 depends on file: /usr/local/sbin/pkg - found
=> BackupPC-3.3.2.tar.gz doesn't seem to exist in /usr/home/dbaio/FreeBSD/ports_head/distfiles/.
=> Attempting to fetch https://github.com/backuppc/backuppc/releases/download/3.3.2/BackupPC-3.3.2.tar.gz
BackupPC-3.3.2.tar.gz                         100% of  544 kB  366 kBps 00m01s
===> Fetching all distfiles required by backuppc-3.3.2_2 for building

$ make checksum
===>  License GPLv2 accepted by the user
===>   backuppc-3.3.2_2 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by backuppc-3.3.2_2 for building
=> SHA256 Checksum OK for BackupPC-3.3.2.tar.gz.

sysutils/backuppc4

$ portlint -C
WARN: Makefile: possible use of absolute pathname "/var/db/BackupPC".
WARN: /usr/home/dbaio/FreeBSD/ports_head/sysutils/backuppc4/distinfo: [1]: TIMESTAMP is over 30 days old
0 fatal errors and 2 warnings found.

$ make fetch
===>  License GPLv3 accepted by the user
===>   backuppc4-4.1.2 depends on file: /usr/local/sbin/pkg - found
=> BackupPC-4.1.2.tar.gz doesn't seem to exist in /usr/home/dbaio/FreeBSD/ports_head/distfiles/.
=> Attempting to fetch https://github.com/backuppc/backuppc/releases/download/4.1.2/BackupPC-4.1.2.tar.gz
BackupPC-4.1.2.tar.gz                         100% of  607 kB  370 kBps 00m02s
===> Fetching all distfiles required by backuppc4-4.1.2 for building

$ make checksum
===>  License GPLv3 accepted by the user
===>   backuppc4-4.1.2 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by backuppc4-4.1.2 for building
=> SHA256 Checksum OK for BackupPC-4.1.2.tar.gz.