Address code review.

compiler/lineinfos.nim

@@ -144,7 +144,7 @@ const
     hintSuccess: "operation successful: $#",
     # keep in sync with `testament.isSuccess`
     hintSuccessX: "$loc lines; ${sec}s; $mem; proj: $project; out: $output",
-    hintBuildMode: "$build",
+    hintBuildMode: "$1",
     hintCC: "CC: $1",
     hintLineTooLong: "line too long",
     hintXDeclaredButNotUsed: "'$1' is declared but not used",

compiler/main.nim

@@ -409,9 +409,7 @@ proc mainCommand*(graph: ModuleGraph) =
       "project", project,
       "output", output,
       ])
-    rawMessage(conf, hintBuildMode, [
-      "build", build,
-      ])
+    rawMessage(conf, hintBuildMode, build)
 
   when PrintRopeCacheStats:
     echo "rope cache stats: "