base: don't prune pyDevSup custom python libraries.

Some of the dynamic libraries built by pyDevSup are not directly linked
into the IOC binary, but rather dlopen(3)'ed by Python interpreter when
a "import" statement is reached. To avoid having all users of pyDevSup
manually specify which ones to keep, define everything inside
python3.<minor-version>/linux-<architecture> to be kept by
lnls-prune-artifacts.

We use globs here (whose expansion is deferred) to avoid changing the
minor version every distro upgrade.

base/install_modules.sh

@@ -96,6 +96,7 @@ echo PYTHON=python3 >> pyDevSup/configure/CONFIG_SITE
 install_module pyDevSup PYDEVSUP "
 EPICS_BASE
 "
+echo 'python3*/linux*/' > pyDevSup/.lnls-keep-paths
 
 mkdir snmp
 cd snmp