Add test mapping to run the libunwind tests.

Created a special target, libunwindstack_unit_test, that doesn't
include the test that dlopen's a shared library. It appears atest
doesn't understand how to handle the require keyword.

Also, move the shared library into the libunwindstack_test directory
itself.

Test: Ran atest libunwindstack_unit_test.
Change-Id: I967919b1d74a08669b61d0363d80861685725609
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index 14246ae..da18af6 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -153,12 +153,12 @@
     shared_libs: [
         "libunwindstack",
     ],
+    relative_install_path: "libunwindstack_test",
 }
 
-cc_test {
-    name: "libunwindstack_test",
+cc_defaults {
+    name: "libunwindstack_testlib_flags",
     defaults: ["libunwindstack_flags"],
-    isolated: true,
 
     srcs: [
         "tests/ArmExidxDecodeTest.cpp",
@@ -183,7 +183,6 @@
         "tests/ElfTestUtils.cpp",
         "tests/IsolatedSettings.cpp",
         "tests/JitDebugTest.cpp",
-        "tests/LocalUnwinderTest.cpp",
         "tests/LogFake.cpp",
         "tests/MapInfoCreateMemoryTest.cpp",
         "tests/MapInfoGetBuildIDTest.cpp",
@@ -253,11 +252,28 @@
         "tests/files/offline/straddle_arm/*",
         "tests/files/offline/straddle_arm64/*",
     ],
+}
+
+cc_test {
+    name: "libunwindstack_test",
+    defaults: ["libunwindstack_testlib_flags"],
+    isolated: true,
+
+    srcs: [
+        "tests/LocalUnwinderTest.cpp",
+    ],
     required: [
         "libunwindstack_local",
     ],
 }
 
+// Skip LocalUnwinderTest until atest understands required properly.
+cc_test {
+    name: "libunwindstack_unit_test",
+    defaults: ["libunwindstack_testlib_flags"],
+    isolated: true,
+}
+
 //-------------------------------------------------------------------------
 // Tools
 //-------------------------------------------------------------------------