Rename variable containing Core Java libraries in build/apex/Android.bp.

Rename `libcore_target_java_libs` as `libcore_java_libs`, as that
variable is used for both device and host APEX packages.

Test: mmma art/build/apex
Bug: 113373927
Change-Id: Iad2838437aacc3c267f140c036c6dfcd479bec6c
diff --git a/build/apex/Android.bp b/build/apex/Android.bp
index f7ed826..735755f 100644
--- a/build/apex/Android.bp
+++ b/build/apex/Android.bp
@@ -94,7 +94,16 @@
     "libartd-disassembler"
 ]
 
-// Libcore native libraries.
+// Core Java libraries.
+libcore_java_libs = [
+    "core-oj",
+    "core-libart",
+    "okhttp",
+    "bouncycastle",
+    "apache-xml",
+]
+
+// Native libraries that support the core Java libraries.
 libcore_native_shared_libs = [
     "libjavacore",
     "libopenjdk",
@@ -103,15 +112,6 @@
     "libziparchive"
 ]
 
-// Java libraries
-libcore_target_java_libs = [
-    "core-oj",
-    "core-libart",
-    "okhttp",
-    "bouncycastle",
-    "apache-xml",
-]
-
 // Temporary library includes for b/123591866 as all libraries are moved into the main art-apex.
 art_runtime_libraries_zipapex = [
     "libnativebridge",
@@ -143,7 +143,7 @@
     name: "com.android.runtime.release",
     compile_multilib: "both",
     manifest: "manifest.json",
-    java_libs: libcore_target_java_libs,
+    java_libs: libcore_java_libs,
     native_shared_libs: art_runtime_base_native_shared_libs
         + bionic_native_shared_libs
         + libcore_native_shared_libs,
@@ -173,7 +173,7 @@
     name: "com.android.runtime.debug",
     compile_multilib: "both",
     manifest: "manifest.json",
-    java_libs: libcore_target_java_libs,
+    java_libs: libcore_java_libs,
     native_shared_libs: art_runtime_base_native_shared_libs
         + art_runtime_debug_native_shared_libs
         + bionic_native_shared_libs
@@ -212,7 +212,7 @@
     host_supported: true,
     device_supported: false,
     manifest: "manifest.json",
-    java_libs: libcore_target_java_libs,
+    java_libs: libcore_java_libs,
     ignore_system_library_special_case: true,
     native_shared_libs: art_runtime_base_native_shared_libs
         + art_runtime_debug_native_shared_libs