Build FreeBSD as a Linux variant in GN (series 0003): use the
shared-library config for current_os "freebsd" too.
FreeBSD-specific, not submitted upstream yet.
--- build/config/BUILD.gn.orig	2026-09-29 08:00:52 UTC
+++ build/config/BUILD.gn
@@ -21,7 +21,8 @@ config("shared_library_config") {
 
 config("shared_library_config") {
   if (current_os == "android" || current_os == "fuchsia" ||
-      current_os == "linux" || current_os == "mac") {
+      current_os == "linux" || current_os == "freebsd" ||
+      current_os == "mac") {
     cflags = [ "-fPIC" ]
   }
 }