Do not modify LD_LIBRARY_PATH when setting install_path

Previously, it was required to add <root>/lib to LD_LIBRARY_PATH because
CADET-Core was not setting the RPATH correctly. This was fixed in CADET
v4.4.0
Since the lib path was simply appended to os.environ['LD_LIBRARY_PATH']
this could lead to inconsistent behaviour when trying to compare
different versions of CADET-Core and other versions were not properly
removed.

cadet/cadet.py

@@ -1,6 +1,5 @@
 import copy
 import json
-import os
 import platform
 import pprint
 import shutil
@@ -337,15 +336,6 @@ def install_path(self, install_path):
         if dll_path.is_file():
             self.cadet_dll_path = dll_path.as_posix()
 
-        if platform.system() != 'Windows':
-            try:
-                cadet_lib_path = cadet_root / 'lib'
-                if cadet_lib_path.as_posix() not in os.environ['LD_LIBRARY_PATH']:
-                    os.environ['LD_LIBRARY_PATH'] += \
-                        os.pathsep + cadet_lib_path.as_posix()
-            except KeyError:
-                os.environ['LD_LIBRARY_PATH'] = cadet_lib_path.as_posix()
-
     def transform(self, x):
         return str.upper(x)