We now embed a checksum in the generated CMakeLists.txt files.
The emulators cmake build system will use this to make sure the
makefiles have not changed.

Changing the makefiles without regenerating the CMakeLists.txt will
result in a build break in the emulator.

Change-Id: I242dd3292b0d876d80d92cd36bdbe62c6197d259

bug: 111137294
bug: 118433589

+ Remove duplicate encoding logic in goldfish_vk_marshaling

Change-Id: I9fd3a060276bd4f3e7f18acdcfe7371075c27a5f

bug: 111137294
bug: 118433669

Change-Id: I996c0608fad1cd8b22ae1bad952cd188f0403926

Adds a GNUMakefile that will generate the cmake files based upon the
android makefiles. This will make it easier to keep the makefiles in
sync. If the makefiles change, we will have to run make in this
directory.

It relies on the following:

- The android.mk files are using the emugl dependency mechanism
- You are in the emulator repo (as we need the emulator build.mk files)
- We translate the emugl -> json representation.
- We write the json representation to disk
- We have a python script that transforms the json to cmake

It is all driven by GNUmake, so all you have to do is type make to
regenerate the files. SOONG does not use GNUMakefiles so we should be
able to co-exist.

Change-Id: I6f9ae22397bcf9987699b946aa14921b00fc94b0