RFR: 8357991: make bootcycle-images is broken after JDK-8349665

[Magnus Ihse Bursie]

`make bootcycle-images` broke after JDK-8349665, with the symptom:


jdk.internal.md.interim/module-info.java:51: error: module not found: jdk.compiler.interim
    requires jdk.compiler.interim; 


This is since the bootcycle build use a special spec.gmk files which point to a special `make-support` directory, and this did not contain the necessary files needed to start running make targets. (Ever since JDK-8292944 they need to be explicitly generated.)

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Commit messages:
 - 8357991: make bootcycle-images is broken after JDK-8349665

Changes: https://git.openjdk.org/jdk/pull/25594/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25594&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357991
  Stats: 11 lines in 1 file changed: 10 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25594.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25594/head:pull/25594

PR: https://git.openjdk.org/jdk/pull/25594