Build instructions cleanup + Windows instructions

BUILD.md

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+# General build instructions
+
+In order to use IDA DOSBox debugger you need to build two things:
+
+1. Client plugin for IDA (this repository)
+2. Custom version of DOSBox which builds in the IDA debugger server ([other repository](https://github.com/wjp/dosbox))
+
+The custom DOSBox build also requires some of the files in this repository, so you will pass the path to this repository in the `--with-ida-plugin` configure flag when compiling DOSBox. (It doesn’t matter which order they are built in.)
+
+# IDADOS plugin
+
+## Windows
+
+1. Install Microsoft Compiler:
+   * [Visual Studio](https://www.visualstudio.com/downloads/download-visual-studio-vs)
+   * [Visual C++ for Python 2.7](http://www.microsoft.com/en-us/download/details.aspx?id=44266)
+1. Set path to IDA SDK in `build_vs.bat`
+1. Open the Visual C++ command line (or open a command line and run `vcvarsall.bat x86`)
+1. Run `build_vs.bat`
+
+Note that the Makefile for MinGW does not work currently. (If you want to try compiling using MinGW, when you link, link to IDA.WLL (rename to IDA.DLL and make sure it is in one of your `-L` paths) using `-Wl,--enable-stdcall-fixup` and *not* the `ida.a` GCC file inside the SDK!)
+
+## Linux
+
+```
+export IDA=/path/to/idasdk64/
+export __LINUX__=1
+perl $IDA/bin/idamake.pl
+```
+
+## Mac OS
+
+```
+export IDA=/path/to/idasdk64/
+export __MAC__=1
+perl $IDA/bin/idamake.pl
+```
+
+---
+
+# DOSBox with IDA debugger support
+
+First, make sure to copy/symlink your IDA library (Linux: `libida.so`, Mac: `libida.dylib`, Windows: `ida.wll`) to your `idasdk/bin` directory. **Windows users:** Rename ida.wll to ida.dll when you copy it! Then, follow the instructions for your platform below.
+
+## 32-bit system (Windows with MinGW-w64 i686, Linux)
+
+```
+./autogen.sh
+./configure --enable-debug=ida32 --with-ida-sdk=/full/path/to/idasdk --with-ida-plugin=/full/path/to/idados
+make
+```
+
+**MinGW-w64 users:** You will need to change the `#if __GNUC__` surrounding the `memicmp` declaration in `idasdk/include/pro.h` to `#if 0` to compile successfully.
+
+## 32-bit DOSBox on 64-bit Linux
+
+```
+./autogen.sh
+CC="cc -m32" CXX="c++ -m32" ./configure --enable-debug=ida32 --with-ida-sdk=/full/path/to/idasdk --with-ida-plugin=/full/path/to/idados --host=i686-pc-linux-gnu
+make
+```
+
+## 32-bit DOSBox on 64-bit Mac OS
+
+(The specific darwin release chosen shouldn’t matter.)
+
+```
+./autogen.sh
+CC="cc -m32" CXX="c++ -m32" ./configure --enable-debug=ida32 --with-ida-sdk=/full/path/to/idasdk --with-ida-plugin=/full/path/to/idados --host=i686-apple-darwin12
+make
+```

build_vs.bat

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+SET IDASDK=..\idasdk69
+
+cl dosbox_rstub.cpp rpc_debmod_dosbox.cpp "%IDASDK%\plugins\debugger\tcpip.cpp" "%IDASDK%\plugins\debugger\rpc_client.cpp" "%IDASDK%\plugins\debugger\rpc_debmod.cpp" "%IDASDK%\plugins\debugger\debmod.cpp" "%IDASDK%\plugins\debugger\rpc_hlp.cpp" "%IDASDK%\plugins\debugger\rpc_engine.cpp" "%IDASDK%\plugins\debugger\util.cpp" /I"%IDASDK%\include" /I"%INCLUDE%" -I"%IDASDK%\plugins\debugger" /D__NT__ /D__VC__ /D__IDP__ /LD /GF /EHs /Gy /FC /Ox /Oi /DNDEBUG /D_SECURE_SCL=0 /MD /ERRORREPORT:QUEUE /Fedosbox_rstub.plw /link /LIBPATH:"%IDASDK%\lib\x86_win_vc_32\;%LIBPATH%" /DLL /LARGEADDRESSAWARE /DYNAMICBASE "%IDASDK%\lib\x86_win_vc_32\ida.lib"