Symbol conflict with system-wide installed LADSPA

[x42]

Install caps LADSPA plugin (here: from debian's "caps" package) and caps-lv2 (here: from git to ~/.lv2) Start Ardour (which scans ladspa: caps.so is loaded).

Adding a caps-lv2 plugin wrongly calls into the system-wide the LADSPA.

Thread 1 "ardour-5.9.6" received signal SIGILL, Illegal instruction.
0x00007fffbc70bb07 in ?? () from /usr/lib/ladspa/caps.so
(gdb) bt
#0  0x00007fffbc70bb07 in  () at /usr/lib/ladspa/caps.so
#1  0x00007fffed3998eb in lilv_plugin_instantiate () at /usr/lib/liblilv-0.so.0
#2  0x00007ffff6939e81 in ARDOUR::LV2Plugin::init(void const*, long) (this=0x5555586e08e0, c_plugin=0x555558f21010, rate=48000) at ../libs/ardour/lv2_plugin.cc:515
#3  0x00007ffff6938eb0 in ARDOUR::LV2Plugin::LV2Plugin(ARDOUR::AudioEngine&, ARDOUR::Session&, void const*, long) (this=0x5555586e08e0, engine=..., 
    session=..., c_plugin=0x555558f21010, rate=48000) at ../libs/ardour/lv2_plugin.cc:344
#4  0x00007ffff6948fa4 in ARDOUR::LV2PluginInfo::load(ARDOUR::Session&) (this=0x55555b8f98b0, session=...) at ../libs/ardour/lv2_plugin.cc:3297
#5  0x000055555625cf02 in PluginSelector::load_plugin(boost::shared_ptr<ARDOUR::PluginInfo>) (this=0x55555bbaae00, pi=...) at ../gtk2_ardour/plugin_selector.cc:549

Probably because both /usr/lib/ladspa/caps.so and ~/.lv2/mod-caps-AutoFilter.lv2/AutoFilter.so have the same symbols.