[GN][MIPS] Add ldso_path and gcc_target_rpath config on MIPS

Use config with these options when target is MIPS

Change-Id: Ia93504f90aa42daef37f1cf1025cef9e9a584034
Reviewed-on: https://chromium-review.googlesource.com/890741Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Miran Karić <miran.karic@mips.com>
Cr-Commit-Position: refs/heads/master@{#50954}

gni/v8.gni

@@ -105,6 +105,12 @@ if (is_posix && (v8_enable_backtrace || v8_monolithic)) {
   v8_add_configs += [ "//build/config/gcc:symbol_visibility_default" ]
 }
 
+# On MIPS gcc_target_rpath and ldso_path might be needed for all builds.
+if (target_cpu == "mipsel" || target_cpu == "mips64el" ||
+    target_cpu == "mips" || target_cpu == "mips64") {
+  v8_add_configs += [ "//build/config/gcc:rpath_for_built_shared_libraries" ]
+}
+
 # All templates should be kept in sync.
 template("v8_source_set") {
   if (defined(invoker.split_count) && invoker.split_count > 1 &&