Use the host javac for bootstrapping

now that the bootstrap build uses the VanillaJavaBuilder it is compatible
with the host JDK's javac, and avoiding -Xbootclasspath/p makes the
bootstrap build more compatible with JDK 9.

See #5521

RELNOTES: N/A
PiperOrigin-RevId: 205605294

src/java_tools/buildjar/BUILD

diff --git a/src/java_tools/buildjar/BUILD b/src/java_tools/buildjar/BUILD
index 999e9b5..32d8852 100644
--- a/src/java_tools/buildjar/BUILD
+++ b/src/java_tools/buildjar/BUILD
@@ -90,7 +90,6 @@
         # Using tiered compilation improves performance of Javac when not using the worker mode.
         "-XX:+TieredCompilation",
         "-XX:TieredStopAtLevel=1",
-        "-Xbootclasspath/p:$(location //third_party/java/jdk/langtools:javac_jar)",
     ],
     singlejar = ["//src/java_tools/singlejar:bootstrap_deploy.jar"],
     source_version = "8",