Rename bundle-linux.sh and bundle-windows.bat → bundle.{sh,bat}

The shell script is also used by macOS and Windows builds, so calling it
'linux' is a bit silly.

bundle/bundle.bat

@@ -0,0 +1,18 @@
+@echo off
+
+SET ARCH=%1
+set PATH=%PATH%;C:\Program Files\7-Zip\
+
+if "%ARCH%" == "x64" (echo Building for 64bit) else (
+  if "%ARCH%" == "x86" (echo Building for 32bit) else (
+    echo Unknown architecture, specity x86 or x64
+    exit /B 1
+  )
+)
+
+rem %HOMEDRIVE%
+rem cd %HOMEPATH%
+call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" %ARCH%
+echo Use full exe names when running under bash, e.g. "msbuild.exe"
+echo Loading bash, you may now use git and msbuild in the same console \o/.
+"C:\Program Files\Git\bin\sh.exe" bundle-linux.sh