RFR: 8348392: Make claims "other matches are possible" even when that is not true

[Magnus Ihse Bursie]

When matching configurations using CONF, normally this is treated as a pattern. However, if an exact match is found, this is exclusively used. This is to allow matching for e.g. linux-x64 and not matching linux-x64-debug, which is otherwise impossible.

To inform the user that this has happened, make prints


Using exact match for CONF=linux-x64 (other matches are possible)


even if no other matches are possible.

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Commit messages:
 - 8348392: Make claims "other matches are possible" even when that is not true

Changes: https://git.openjdk.org/jdk/pull/23261/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23261&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348392
  Stats: 13 lines in 1 file changed: 7 ins; 5 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23261.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23261/head:pull/23261

PR: https://git.openjdk.org/jdk/pull/23261