Use installable lib as Evergreen loader's data dep (youtube#1889)

This change was made a while ago, in
youtube#117, but then reverted in
youtube#500.

I think the original change was reverted either accidentally or to get
symbols included in gtest binaries. But if it was reverted in order to
get symbols in gtest binaraies, that should now be covered by
youtube#1857.

b/268244534
b/192672173

Change-Id: Iacc32af77c1a192136863872f361de4a50d566e0

starboard/build/config/BUILDCONFIG.gn

@@ -393,7 +393,7 @@ template("evergreen_loader") {
   copy("copy_loader_app_lib${original_target_name}") {
     install_content = true
     if (target_cpu == "arm" && arm_float_abi == "softfp") {
-      sources = [ "$root_out_dir/../evergreen-$target_cpu-${arm_float_abi}_$build_type/lib${original_target_name}.so" ]
+      sources = [ "$root_out_dir/../evergreen-$target_cpu-${arm_float_abi}_$build_type/install/lib/lib${original_target_name}.so" ]
     } else if (target_cpu == "arm64") {
       sources = [ "$root_out_dir/../evergreen-$target_cpu_$build_type/install/lib/libcobalt.so" ]
     }