Use 'local-exec' for threadlocal_heap_ in tcmalloc.

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index bdecf4a257593cdbce9ab4efba48386d5b23ade0..f57b8cd5f1ffa91c12aa320997946702fb78fe4b 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -2218,11 +2218,8 @@ test("base_unittests") {
       sources += [ "nix/xdg_util_unittest.cc" ]
     }
 
-    deps += [ "//base/test:malloc_wrapper" ]
-
-    if (!is_component_build) {
-      # Set rpath to find libmalloc_wrapper.so even in a non-component build.
-      configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
+    if (is_component_build) {
+      deps += [ "//base/test:malloc_wrapper" ]
     }
   }