Remove removed selinux prebuilts from $PATH

These were removed in https://android-review.googlesource.com/c/platform/external/selinux/+/1807296

Change-Id: If13bbeff5e14dc0bcc2e1f30ba5d7eab8d0ff6e3
diff --git a/envsetup.sh b/envsetup.sh
index b92e399..b5dc847 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -240,7 +240,7 @@
         export ANDROID_TOOLCHAIN_2ND_ARCH=$gccprebuiltdir/$toolchaindir2
     fi
 
-    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools:$T/external/selinux/prebuilts/bin
+    export ANDROID_DEV_SCRIPTS=$T/development/scripts:$T/prebuilts/devtools/tools
 
     # add kernel specific binaries
     case $(uname -s) in