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/cc_test.go

@@ -2203,7 +2203,7 @@ func TestStaticExecutable(t *testing.T) {
 	ctx := testCc(t, `
 		cc_binary {
 			name: "static_test",
-			srcs: ["foo.c"],
+			srcs: ["foo.c", "baz.o"],
 			static_executable: true,
 		}`)