RFR: 8349665: Make clean removes module-deps.gmk

[Magnus Ihse Bursie]

After [JDK-8292944](https://bugs.openjdk.org/browse/JDK-8292944), we only generate module-deps.gmk once at the start of Init.gmk. This causes `make clean <some other target>` to first generate and then remove module-deps.gmk after which the rest of the build proceeds without a module-deps.gmk, causing problems with dependencies.

-------------

Commit messages:
 - 8349665: Make clean removes module-deps.gmk

Changes: https://git.openjdk.org/jdk/pull/24406/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24406&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349665
  Stats: 10 lines in 2 files changed: 6 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24406.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24406/head:pull/24406

PR: https://git.openjdk.org/jdk/pull/24406