Merge changes I75b4a761,I779f28c6,If1422372,I26307dd1

* changes:
  Introduce inject_bssl_hash library property.
  BoringSSL FIPS build - introduce extraLibFlags and use for STL libs.
  Allow linker scripts when building objects.
  Allow .o files as srcs.

cc/testing.go

@@ -272,7 +272,9 @@ func CreateTestContext(bp string, fs map[string][]byte,
 	mockFS := map[string][]byte{
 		"Android.bp":  []byte(bp),
 		"foo.c":       nil,
+		"foo.lds":     nil,
 		"bar.c":       nil,
+		"baz.o":       nil,
 		"a.proto":     nil,
 		"b.aidl":      nil,
 		"sub/c.aidl":  nil,