Revert "Move gdb support functions to a separate file"

Was reverted on internal master already.

This reverts commit f8d051c81b7c22575ac940dea612fb3b880e6d7a.

Change-Id: Ia432f83bcce91366fb23f1bb87603a093b7f074d
diff --git a/linker/linker.h b/linker/linker.h
index c793b6e..c669c46 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -442,6 +442,7 @@
 
 void debuggerd_init();
 extern "C" abort_msg_t* g_abort_message;
+extern "C" void notify_gdb_of_libraries();
 
 char* linker_get_error_buffer();
 size_t linker_get_error_buffer_size();