[jdk25u-dev] RFR: 8377905: gcc.md included with every build

[Goetz Lindenmaier]

I backport this as folllow-up of JDK-8377509.

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

Commit messages:
 - Backport c0c1775a2b002e82347bb0a0b1167cfe45e7006e

Changes: https://git.openjdk.org/jdk25u-dev/pull/312/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377905
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/312.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/312/head:pull/312

PR: https://git.openjdk.org/jdk25u-dev/pull/312