[jdk21u-dev] RFR: 8325731: Installation instructions for Debian/Ubuntu don't mention autoconf

[Johannes Bechberger]

8325731: Installation instructions for Debian/Ubuntu don't mention autoconf

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Commit messages:
 - Backport c3c1cdd1b017654469f214c62457cde248474f2f

Changes: https://git.openjdk.org/jdk21u-dev/pull/2181/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2181&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325731
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2181.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2181/head:pull/2181

PR: https://git.openjdk.org/jdk21u-dev/pull/2181