Fix dependency on JDK 17 in scripts.

Change-Id: If693340801e0ae5f4e6cf90519bfd5a30116975c

tools/compiledump.py

diff --git a/tools/compiledump.py b/tools/compiledump.py
index 01da6e4..f0cf22e 100755
--- a/tools/compiledump.py
+++ b/tools/compiledump.py
@@ -622,7 +622,9 @@
     return len(version) == 40
 
 
-def run1(out, args, otherargs, jdkhome=jdk.GetDefaultJdkHome(), worker_id=None):
+def run1(out, args, otherargs, jdkhome=None, worker_id=None):
+    if jdkhome is None:
+        jdkhome = jdk.GetDefaultJdkHome()
     jvmargs = []
     compilerargs = []
     for arg in otherargs: