[LSC] Add LOCAL_LICENSE_KINDS to external/libcxx

Added SPDX-license-identifier-Apache-2.0 SPDX-license-identifier-BSD
    SPDX-license-identifier-MIT SPDX-license-identifier-NCSA
to:
  Android.bp

Bug: 68860345
Bug: 151177513
Bug: 151953481

Test: m all

Exempt-From-Owner-Approval: janitorial work
Change-Id: I36daefefdf3ea2b62cdb56e2ac13a810091d5283

Android.bp

@@ -14,6 +14,38 @@
 // limitations under the License.
 //
 
+package {
+    default_applicable_licenses: ["external_libcxx_license"],
+}
+
+// Added automatically by a large-scale-change that took the approach of
+// 'apply every license found to every target'. While this makes sure we respect
+// every license restriction, it may not be entirely correct.
+//
+// e.g. GPL in an MIT project might only apply to the contrib/ directory.
+//
+// Please consider splitting the single license below into multiple licenses,
+// taking care not to lose any license_kind information, and overriding the
+// default license using the 'licenses: [...]' property on targets as needed.
+//
+// For unused files, consider creating a 'fileGroup' with "//visibility:private"
+// to attach the license to, and including a comment whether the files may be
+// used in the current project.
+// See: http://go/android-license-faq
+license {
+    name: "external_libcxx_license",
+    visibility: [":__subpackages__"],
+    license_kinds: [
+        "SPDX-license-identifier-Apache-2.0",
+        "SPDX-license-identifier-BSD",
+        "SPDX-license-identifier-MIT",
+        "SPDX-license-identifier-NCSA",
+    ],
+    license_text: [
+        "LICENSE.TXT",
+    ],
+}
+
 cc_defaults {
     name: "libc++ defaults",
     host_supported: true,