Add wxDynamicLibrary::GetModuleFromAddress().

Use dladdr() under Unix, if available, to provide the same functionality as we
get from GetModuleHandleEx() under MSW and export it in a new public function.

Closes #15248.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76114 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

setup.h_vms

@@ -1177,6 +1177,9 @@ typedef pid_t GPid;
 /* Define if you have the dlerror function.  */
 #define HAVE_DLERROR 1
 
+/* Define if you have the dladdr function.  */
+#undef HAVE_DLADDR
+
 /* Define if you have Posix fnctl() function. */
 #define HAVE_FCNTL 1