[OPENJDK-4113] don't adjust securerandom.source

Since kernel v5.6 (2020), /dev/random no longer blocks and
is functionally equivalent to /dev/urandom. So there's  no
point in adjusting securerandom.source.

Signed-off-by: Jonathan Dowland <[email protected]>

Author: jmtd

modules/jdk/21/configure.sh

@@ -30,6 +30,3 @@ modules:
   install:
   - name: jboss.container.user
   - name: jboss.container.openjdk
-
-execute:
-- script: configure.sh