Remove libselinux from the apex_available whitelist

libselinux no longer is included in any APEX. Only the platform variant
of it (/system/lib/libselinux.so) exists and APEXes link to it.

Removing the lib name from the whitelist to make it clear that the
library is not available to any APEX.

Bug: 151053366
Bug: 150999716
Test: m

Exempt-From-Owner-Approval: cherry-pick from aosp

Merged-In: Id4fb933141ad32ff5217a58f1c7d689cc657e9ea
(cherry picked from commit 1731f6ae3fc4d4bc9ca2dd42f54f052e292698cb)
Change-Id: Id4fb933141ad32ff5217a58f1c7d689cc657e9ea
diff --git a/apex/apex.go b/apex/apex.go
index b833634..ec72bf6 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -107,7 +107,6 @@
 		"libpcre2",
 		"libprocessgroup_headers",
 		"libqemu_pipe",
-		"libselinux",
 		"libsystem_headers",
 		"libutils_headers",
 	}
@@ -503,7 +502,6 @@
 		"libprocessgroup",
 		"libprocessgroup_headers",
 		"libprocinfo",
-		"libselinux",
 		"libsonivox",
 		"libspeexresampler",
 		"libspeexresampler",