Run valgrind related tests on all release architectures where valgrind
is available.

This allows more tests to run which would otherwise be skipped.
As valgrind is currently not available everywhere, restrict it to amd64
for now.

The rscript_parse_time.sh test calls the python script
rscript_parse_time_get-ts.py for the date/time calculations.

Gbp-Dch: Short

Update to upstream version '8.31.0'
with Debian dir 19f787a4d4d737fe6a606736e258cfa3561830bb

Closes: #882261

Somehow this broke the test suite and made lots of tests fail.

This reverts commit 3766cd64.

This ensures we can build twice in a row. The pre-generated files in
grammar/ are removed on make clean.

Gbp-Dch: Ignore

with Debian dir 9b096f88b949b73622db4fe91cbe01625d916d72

Closes: #872568

The extra priority has been deprecated in the debian policy and the
overrides in the debian archive were updated accordingly.

with Debian dir 0ef690cce58202f3f9307b7de21a401ed314f0c1

This module is required to successfully run the test suite.