Refactoring before introducing Windows RT ARM build.

--HG--
branch : distribute
extra : rebase_source : 96035e75dcfab459652403b1001f34c12205fd7f

msvc-build-launcher.cmd

 @echo off
 
 REM VCVARSALL may be in Program Files or Program Files (x86)
-PATH=C:\Program Files\Microsoft Visual Studio 9.0\VC;%PATH%
-PATH=C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC;%PATH%
+REM Use old Visual Studio 2008 so created .exe will be compatible with
+REM old Windows versions. Free express edition can be downloaded via:
+REM http://download.microsoft.com/download/8/B/5/8B5804AD-4990-40D0-A6AA-CE894CBBB3DC/VS2008ExpressENUX1397868.iso
+set PATH_OLD=%PATH%
+set PATH=C:\Program Files\Microsoft Visual Studio 9.0\VC;%PATH%
+set PATH=C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC;%PATH%
 
 REM set up the environment to compile to x86
-call VCVARSALL x86
-cl /D "GUI=0" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x86 /out:setuptools/cli-32.exe
-cl /D "GUI=1" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x86 /out:setuptools/gui-32.exe
+call VCVARSALL x86 >nul 2>&1
+if "%ERRORLEVEL%"=="0" (
+  cl /D "GUI=0" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x86 /out:setuptools/cli-32.exe
+  cl /D "GUI=1" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x86 /out:setuptools/gui-32.exe
+) else (
+  echo Visual Studio ^(Express^) 2008 not found to build Windows 32-bit version
+)
 
 REM now for 64-bit
-call VCVARSALL x86_amd64
-cl /D "GUI=0" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x64 /out:setuptools/cli-64.exe
-cl /D "GUI=1" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x64 /out:setuptools/gui-64.exe
\ No newline at end of file
+call VCVARSALL x86_amd64 >nul 2>&1
+if "%ERRORLEVEL%"=="0" (
+  cl /D "GUI=0" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x64 /out:setuptools/cli-64.exe
+  cl /D "GUI=1" /D "WIN32_LEAN_AND_MEAN" launcher.c /O2 /link /MACHINE:x64 /out:setuptools/gui-64.exe
+) else (
+  echo Visual Studio ^(Express^) 2008 not found to build Windows 64-bit version
+)
+
+set PATH=%PATH_OLD%
+