[CMake] set INSTALL_RPATH for python on linux (#139)

To avoid the need to set `LD_LIBRARY_PATH` when the
`CMAKE_INSTALL_PREFIX` is not a standard one.
11 jobs for devel in 25 minutes and 15 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed doc-coverage #124365

00:15:14

39.0%
failed format #124366
allowed to fail

00:00:31

passed robotpkg-py-tsid-18.04 #124356

00:20:35

passed robotpkg-py-tsid-20.04 #124357

00:12:14

passed robotpkg-py-tsid-buster #124358

00:00:29

passed robotpkg-py-tsid-stretch #124359

00:25:14

passed robotpkg-tsid-18.04 #124360

00:00:38

passed robotpkg-tsid-20.04 #124361

00:05:49

passed robotpkg-tsid-buster #124362

00:10:25

passed robotpkg-tsid-ferrum #124363

00:10:39

passed robotpkg-tsid-stretch #124364

00:05:42

 
Name Stage Failure
failed
format Test
./demo/demo_quadruped.py:202:35: E231 missing whitespace after ','
./demo/demo_quadruped.py:207:1: W293 blank line contains whitespace
./demo/demo_quadruped.py:208:37: E231 missing whitespace after ','
./demo/demo_quadruped.py:210:31: E231 missing whitespace after ','
./demo/demo_quadruped.py:211:35: E231 missing whitespace after ','
./demo/demo_quadruped.py:212:35: E231 missing whitespace after ','
./demo/demo_quadruped.py:217:1: W293 blank line contains whitespace
Cleaning up file based variables
ERROR: Job failed: exit code 1