create "Compiling MAME (0.181-latest)" doc

[markwkidd]

There has always been a stream of people requesting previous versions of the MAME core.

I do realize that not all of those people are going to be able to compile their own core for reasons of technical proficiency or because they are using a difficult platform to compile for like Android.

However I believe we could use not just a compilation guide for MAME-git but one that has a section describing how to build older commits.

[hizzlekizzle]

I think that's a good idea. I frequently tell people "checkout the desired revision from git and compile" but I don't think anyone has ever taken me up on it :P

[markwkidd]

Documentation WIP

Building libretro-mame

Install build dependencies

Windows

1. Begin by installing and configuring the RetroArch msys2 build environment as described in that documentation: https://docs.libretro.com/development/retroarch/compilation/windows
2. From the msys2 console, install python with the command pacman -S python

Clone the repository

git clone http://github.com/libretro/mame
cd mame

general make syntax

Build type	Command
Complete build	make -f -j3 Makefile.libretro
Arcade-only build	make -f -j3 Makefile.libretro SUBTARGET=arcade
Softlist-only build	make -f -j3 Makefile.libretro SUBTARGET=mess

Platform-specific make syntax

Platform	Command
64-bit processors	make -f -j3 Makefile.libretro PTR64=1

Building a previous version

!!! Important
If you want to build a previous version of MAME, begin by making sure that you can build the most recent version.

Once you have built the most recent version of MAME to establish that your build environment is complete, reset the contents of the repository to a clean state:

make clean
git reset --hard

!!! Warning
These commands will delete any files in your mame subfolder that are not in the libretro/mame github repository.

checkout the previous version source

See the section "Commit hashes for previous versions" below to find the correct commit hash. For example, if you wish to build MAME 0.205, the corresponding commit hash is b691c38.

Use this commit hash and the git checkout command to roll back the source to your chosen version:

git checkout b691c38

Commit hashes for previous versions

Version	Commit
mame0207	40fc339
mame0206	cf02fe3
mame0205	b691c38
mame0204	c6150e7
mame0203	b57a140
mame0202	856478f
mame0201	4dc302e
mame0200	ff19cd3
mame0199	f2e805a
mame0198	c5f6a62
mame0197	74293f8
mame0196	e8f2016
mame0195	e44e85b
mame0194	5be2496
mame0193	bf28b34
mame0192	d771f54
mame0191	a5db728
mame0190	f57574c
mame0189	2beedc5
mame0188	7b45ec1
mame0187	1d9648b
mame0186	e4c6cb1
mame0185	fe01a13
mame0184	7768128
mame0183	4ee22dc
mame0182	22c42ab
mame0181	3a1651e