git: openjdk/jdk8u: 8304053: Revert os specific stubs for SystemMetrics

[Severin Gehwolf]

Changeset: 89aeae16
Author:    Adam Farley <afarley at openjdk.org>
Committer: Severin Gehwolf <sgehwolf at openjdk.org>
Date:      2023-03-15 14:11:17 +0000
URL:       https://git.openjdk.org/jdk8u/commit/89aeae16e85ddfbd581cb86d0b0480b1e2d50e99

8304053: Revert os specific stubs for SystemMetrics

Reviewed-by: sgehwolf, andrew

! jdk/make/CompileJavaClasses.gmk
- jdk/src/aix/classes/jdk/internal/platform/SystemMetrics.java
- jdk/src/macosx/classes/jdk/internal/platform/SystemMetrics.java
- jdk/src/unix/classes/jdk/internal/platform/SystemMetrics.java