Enable libunwind on Host bionic

Bug: 31559095
Test: Test linux_bionic compile
Change-Id: If024f482d6f4ff1ef260f48c1d58f552a5904e18
diff --git a/Android.bp b/Android.bp
index f4653de..1ced88e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -379,13 +379,17 @@
         android: {
             shared_libs: ["libdl"],
         },
-        host: {
+        linux: {
             ldflags: ["-nostdlib"],
             host_ldlibs: [
                 "-lc",
                 "-lpthread",
             ],
         },
+        linux_bionic: {
+            enabled: true,
+            shared_libs: ["libdl"],
+        },
     },
 
     export_include_dirs: ["include"],
@@ -431,6 +435,12 @@
     ],
 
     whole_static_libs: ["libunwind"],
+
+    target: {
+        linux_bionic: {
+            enabled: true,
+        },
+    },
 }
 
 //-----------------------------------------------------------------------