[GN] Add solink_module tool on the Mac, Win, and GCC toolchains.

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index 643ded82c1df0be7004de9af7c23856a2b80bbe2..65599a2d95863fe5005e8fe33ed9ca2fe8fc5c48 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -431,7 +431,8 @@ set_defaults("static_library") {
   configs = _native_compiler_configs
 }
 
-# Shared library defaults (also for components in component mode).
+# Shared library and loadable module defaults (also for components in component
+# mode).
 _shared_library_configs =
     _native_compiler_configs + [ "//build/config:default_libs" ]
 if (is_win) {
@@ -447,6 +448,9 @@ if (is_win) {
 set_defaults("shared_library") {
   configs = _shared_library_configs
 }
+set_defaults("loadable_module") {
+  configs = _shared_library_configs
+}
 if (is_component_build) {
   set_defaults("component") {
     configs = _shared_library_configs