Don't use whole_static_libs in libnativeloader.

It has the effect that all the headers of those libs get included in
the libnativeloader prebuilt snapshots, which in this particular case
makes it contain all the xxx.sysprop.h generated headers from
PlatformPropoerties.

Test: mmm art/libnatveloader
Test: `m art-module-sdk` and check that art-module-sdk-current.zip
  doesn't have any .sysprop.h files
Bug: 178379642
Change-Id: Ic11007945fd6f1cd2d7996cae8a7b533c91aea7b
diff --git a/libnativeloader/Android.bp b/libnativeloader/Android.bp
index dbcde12..993e5d5 100644
--- a/libnativeloader/Android.bp
+++ b/libnativeloader/Android.bp
@@ -57,7 +57,7 @@
             shared_libs: [
                 "libdl_android",
             ],
-            whole_static_libs: [
+            static_libs: [
                 "PlatformProperties",
             ],
         },