Reland "Add libdl_android to the Runtime (aka Bionic) APEX".

Before this it ended up in /system.

Test: build & boot
Test: adb shell find system apex -name libdl_android.so | xargs adb shell ls -l
  =>
  apex/com.android.runtime/lib/bionic/libdl_android.so
  apex/com.android.runtime/lib64/bionic/libdl_android.so
  apex/com.android.runtime@1/lib/bionic/libdl_android.so
  apex/com.android.runtime@1/lib64/bionic/libdl_android.so
  system/lib/bootstrap/libdl_android.so
  system/lib/libdl_android.so -> /apex/com.android.runtime/lib/bionic/libdl_android.so
  system/lib64/bootstrap/libdl_android.so
  system/lib64/libdl_android.so -> /apex/com.android.runtime/lib64/bionic/libdl_android.so
Test: atest CtsBionicTestCases
Test: Repro in b/144343305#comment8 together with ag/9754153
Bug: 135753770
Bug: 144343305
Change-Id: I9ccd10b711223ca474e91741711b7b8efd521b2d

Author: marstj

CleanSpec.mk

@@ -57,6 +57,11 @@ $(call add-clean-step, rm -f $(PRODUCT_OUT)/system/lib64/libGLES*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/root/bionic)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/recovery/root/bionic)
 
+# Ensure libdl_android.so is (only) in the correct locations after the move into
+# the Runtime APEX.
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/apex/com.android.runtime/lib{,64})
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib{,64})
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************

apex/Android.bp

@@ -29,6 +29,7 @@ apex {
         "libc",
         "libm",
         "libdl",
+        "libdl_android",
         "libc_malloc_debug",
         "libc_malloc_hooks",
     ],

libdl/Android.bp

@@ -185,6 +185,11 @@ cc_library {
         symbol_file: "libdl_android.map.txt",
         versions: ["10000"],
     },
+
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.runtime",
+    ],
 }
 
 ndk_library {