Add libselinux.so.1 to package allow list (#3661)

Some distros (Arch) don't use SELinux, so it
won't be present on those systems.

freeze.py

@@ -284,6 +284,7 @@ def find_files(directory, patterns):
             libpath = libdetailsparts[0].strip()
             libpath_file = os.path.basename(libpath)
             if (libpath
+                and os.path.exists(libpath)
                 and not libpath.startswith("/lib")
                 and "libnvidia-glcore.so" not in libpath
                 and libpath_file not in [
@@ -306,13 +307,21 @@ def find_files(directory, patterns):
                     "libpangocairo-1.0.so.0",
                     "libpangoft2-1.0.so.0",
                     "libharfbuzz.so.0",
-                    "libthai.so.0" ]
-                ) or libpath_file in ["libgcrypt.so.11", "libQt5DBus.so.5", "libpng12.so.0",
-                                      "libbz2.so.1.0", "libqxcb.so", "libxcb-xinerama.so.0", "libpcre.so.3"]:
-                # Ignore missing files
-                if os.path.exists(libpath):
-                    filepath, filename = os.path.split(libpath)
-                    external_so_files.append((libpath, filename))
+                    "libthai.so.0",
+                    ]
+               ) or libpath_file in [
+                    "libgcrypt.so.11",
+                    "libQt5DBus.so.5",
+                    "libpng12.so.0",
+                    "libbz2.so.1.0",
+                    "libqxcb.so",
+                    "libxcb-xinerama.so.0",
+                    "libpcre.so.3",
+                    "libselinux.so.1",
+                    ]:
+                external_so_files.append((libpath, libpath_file))
+                # Any other lib deps that fail to meet the inclusion
+                # criteria above will be silently skipped over
 
 elif sys.platform == "darwin":
     # Copy Mac specific files that cx_Freeze misses