Allow building the Bazel server for OpenBSD.

This change, split out of the larger PR https://github.com/bazelbuild/bazel/pull/10274, is part of the OpenBSD port in https://github.com/bazelbuild/bazel/issues/10250.

Closes #10386.

PiperOrigin-RevId: 285973120
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java b/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
index 9542381..5fb95f7 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/CommonCommandOptions.java
@@ -65,8 +65,8 @@
       help =
           "If true, Bazel picks up host-OS-specific config lines from bazelrc files. For example, "
               + "if the host OS is Linux and you run bazel build, Bazel picks up lines starting "
-              + "with build:linux. Supported OS identifiers are linux, macos, windows, and "
-              + "freebsd. Enabling this flag is equivalent to using --config=linux on Linux, "
+              + "with build:linux. Supported OS identifiers are linux, macos, windows, freebsd, "
+              + "and openbsd. Enabling this flag is equivalent to using --config=linux on Linux, "
               + "--config=windows on Windows, etc.")
   public boolean enablePlatformSpecificConfig;