[build][LSC] Soft transition to //build/config:werror

Bug: 44466
Change-Id: I6fc709dfd4467b4035f05275d1e36815506f5fc7
diff --git a/BUILD.gn b/BUILD.gn
index 6fd90bf..7d52f0e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -35,14 +35,14 @@
   deps = [
   ]
 
-  include_dirs = [ 
+  include_dirs = [
     ".",
     "include/",
     "lang/usenglish/",
     "lang/cmulex/",
   ]
 
-  defines = [ 
+  defines = [
     "FL_LANG=\"usenglish\"",
     "FL_VOX=\"cmu_us_kal\"",
     "FL_LEX=\"cmulex\"",
@@ -167,8 +167,13 @@
     "src/wavesynth/cst_units.c",
   ]
 
+  configs += [ "//build/config:symbol_visibility_hidden" ]
   configs -= [ "//build/config:symbol_visibility_hidden" ]
+  configs += [ "//build/config:default_warnings"]
   configs -= [ "//build/config:default_warnings"]
+  configs += [ "//build/config/fuchsia:werror" ]
   configs -= [ "//build/config/fuchsia:werror" ]
+  configs += [ "//build/config:werror" ]
+  configs -= [ "//build/config:werror" ]
 
 }