Add platform detection to Windows build

build.ps1

@@ -7,6 +7,10 @@ $Compiler = "cl.exe"
 $GeneralFlags = "/Wall /WX /wd4996"
 $LibraryFlags = "/LD"
 
+$Kernel = (Get-ChildItem Env:OS).Value
+$Machine = (Get-ChildItem Env:PROCESSOR_ARCHITECTURE).Value
+$Platform = "${Kernel}_${Machine}"
+
 $IncludeDirs = Get-ChildItem -Path src -Recurse -Directory -ErrorAction SilentlyContinue -Force | %{$("/I " + '"' + $_.FullName + '"')}
 $SrcFiles = "src/wapp.c"
 
@@ -21,7 +25,7 @@ If ($Release -eq $True) {
   $BuildType = "debug"
 }
 
-$BuildDir = "./libwapp-build/windows-$BuildType"
+$BuildDir = "./libwapp-build/${Platform}-${BuildType}"
 $ObjDir = "$BuildDir/objects"
 $OutDir = "$BuildDir/output"
 $TestsDir = "$BuildDir/tests"