Disable the check for APEX libs in /system for Fuchsia.

Fuchsia doesn't use the APEX packaging layout, nor does it use Bionic with
its linker namespace setup: http://g/android-aml-apex/Hk6jqMjiJ_s

Test: lunch fuchsia_x86_64; m systemimage, together with the kati stage
  library absence check in http://r.android.com/945216
Bug: 124293228

Change-Id: I55fb71f5ae95f268a87560936488f5c1086fcb77
diff --git a/BoardConfig_common.mk b/BoardConfig_common.mk
index 1a95e15..4285b4e 100644
--- a/BoardConfig_common.mk
+++ b/BoardConfig_common.mk
@@ -17,3 +17,4 @@
 TARGET_NO_BOOTLOADER := true
 TARGET_NO_KERNEL := true
 TARGET_NO_RECOVERY := true
+DISABLE_APEX_LIBS_ABSENCE_CHECK := true