Add NES emulator

It's now possible to play classic video game roms with teletypewriters.
https://justine.storage.googleapis.com/nesemu.png

tool/emacs/cosmo-c-builtins.el

@@ -1298,9 +1298,9 @@
         (cosmopolitan-builtin-defines
          '("__COSMOPOLITAN__"
            "__LINKER__"
-           "COSMOPOLITAN_CPP_START_"
-           "COSMOPOLITAN_CPP_END_"
-           "COSMOPOLITAN_CPP_USING_"
+           "COSMOPOLITAN_CXX_START_"
+           "COSMOPOLITAN_CXX_END_"
+           "COSMOPOLITAN_CXX_USING_"
            "COSMOPOLITAN_C_START_"
            "COSMOPOLITAN_C_END_"
            "MACHINE_CODE_ANALYSIS_BEGIN_"

tool/emacs/cosmo.el

@@ -1,4 +1,4 @@
-(require 'mog-mode)
+(require 'ctest-mode)
 (require 'ld-script)
 (require 'optinfo-mode)
 (require 'protobuf-mode)