ioc: prune EPICS base directories from non-static builds.

EPICS base has rather large configuration files for build, and other
repository files, which are not needed in the IOC images. Prune them
after building the IOCs, shrinking about 40MB the final image size.

Prune is performed with the same script as modules, which discards all
executables in `bin` (~15MB), as well as Perl scripts. This should be
fine considering that `static-link` target also does not preserve EPICS
binaries in the resulting image.

base/lnls-prune-artifacts.sh

@@ -153,6 +153,8 @@ clean_up_epics_modules() {
         echo "Pruning module '$dir'..."
         prune_module_dirs $dir
     done
+
+    prune_module_dirs $EPICS_BASE_PATH
 }
 
 clean_up_epics_modules $@