Rename linker greylist to exempt-list

Update a comment in android-changes-for-ndk-developers.md about the
removed debug.ld.greylist_disabled system property.

Update language to comply with Android's inclusive language guidance

  #inclusivefixit

See https://source.android.com/setup/contribute/respectful-code for reference

Bug: http://b/162536543
Test: bionic-unit-tests
Change-Id: I760ee14bce14d9d799926c43d2c14fd8ffbc6968
diff --git a/tests/dlext_private.h b/tests/dlext_private.h
index b338ae0..262af4c 100644
--- a/tests/dlext_private.h
+++ b/tests/dlext_private.h
@@ -56,10 +56,10 @@
    */
   ANDROID_NAMESPACE_TYPE_SHARED = 2,
 
-  /* This flag instructs linker to enable grey-list workaround for the namespace.
+  /* This flag instructs linker to enable exempt-list workaround for the namespace.
    * See http://b/26394120 for details.
    */
-  ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED = 0x08000000,
+  ANDROID_NAMESPACE_TYPE_EXEMPT_LIST_ENABLED = 0x08000000,
 
   ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED |
                                            ANDROID_NAMESPACE_TYPE_ISOLATED,