Convert to Android.bp

See build/soong/README.md for more information.

I tested the following tests on a Nexus9 and linux host, and they
continued to pass:

/data/nativetest{,64}/bootstat_tests/bootstat_tests
out/host/linux-x86/bin/nativetest{,64}/bootstat_tests/bootstat_tests
/data/nativetest64/memunreachable_test/memunreachable_test
out/host/linux-x86/bin/nativetest{,64}/memunreachable_test/memunreachable_test

These continue to fail just like before this change:

/data/nativetest{,64}/sync_test/sync_test (was /system/bin/sync_test)
/data/nativetest{,64}/sync-unit-test/sync-unit-test
/data/nativetest/memunreachable_test/memunreachable_test

Test: See above
Change-Id: I691e564e0cf008dd363e3746223b153d712e024d
diff --git a/libsync/Android.bp b/libsync/Android.bp
new file mode 100644
index 0000000..4948aa5
--- /dev/null
+++ b/libsync/Android.bp
@@ -0,0 +1,42 @@
+cc_defaults {
+    name: "libsync_defaults",
+    srcs: ["sync.c"],
+    local_include_dirs: ["include"],
+    export_include_dirs: ["include"],
+    cflags: ["-Werror"],
+}
+
+cc_library_shared {
+    name: "libsync",
+    defaults: ["libsync_defaults"],
+}
+
+// libsync_recovery is only intended for the recovery binary.
+// Future versions of the kernel WILL require an updated libsync, and will break
+// anything statically linked against the current libsync.
+cc_library_static {
+    name: "libsync_recovery",
+    defaults: ["libsync_defaults"],
+}
+
+cc_test {
+    name: "sync_test",
+    defaults: ["libsync_defaults"],
+    gtest: false,
+    srcs: ["sync_test.c"],
+}
+
+cc_test {
+    name: "sync-unit-tests",
+    shared_libs: ["libsync"],
+    srcs: ["tests/sync_test.cpp"],
+    cflags: [
+        "-g",
+        "-Wall",
+        "-Werror",
+        "-std=gnu++11",
+        "-Wno-missing-field-initializers",
+        "-Wno-sign-compare",
+    ],
+    clang: true,
+}