floss: have floss built with libstructuredmetrics

Update the Floss build process to utilize the new GN flag target_os and
environmental variable TARGET_OS_VARIENT to include
libstructuredmetrics when building for ChromeOS. Correct GN syntaxes.

BUG: 232098615
Tag: #floss
Test: ./build.py --target test
Test: emerge-${BOARD} floss

Change-Id: I0bf960751643f12f7e1ef03c7aa844d112fbb5d5

1 files changed, 1 insertions, 1 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 51b4438357..7fa609795a 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -25,7 +25,7 @@ group("all") {
 }
 
 # Tools should be built for the host target.
-if (host_cpu == target_cpu && host_os == target_os) {
+if (target_os == "linux") {
   group("tools") {
     deps = [ "//bt/system:tools" ]
   }