RFR: 8269758: idea.sh doesn't work when there are multiple configurations available.

[Jorn Vernee]

>From the JBS issue:

The idea.sh script invokes `make`, but doesn't specify a configuration. So, when multiple configurations are present, this results in an error like this:


$ bash bin/idea.sh java.base
Error: No CONF given, but more than one configuration found.
Available configurations in /mnt/c/jdk/build:
* conf1
* conf2
* conf3
Please retry building with CONF=<config pattern> (or SPEC=<spec file>).

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Commit messages:
 - Allow specifying conf to idea.sh

Changes: https://git.openjdk.java.net/jdk/pull/4654/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4654&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269758
  Stats: 7 lines in 1 file changed: 5 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4654.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4654/head:pull/4654

PR: https://git.openjdk.java.net/jdk/pull/4654