Improve appeyor build

Check bench number and do not
hard-code *.cpp file names.

No functional change.

appveyor.yml

@@ -1,5 +1,5 @@
 version: 1.0.{build}
-clone_depth: 5
+clone_depth: 50
 
 branches:
   only:
@@ -28,18 +28,40 @@ init:
   - msbuild /version
 
 before_build:
-  - cd src
-  - echo project (Stockfish) >> CMakeLists.txt
-  - echo add_executable(stockfish benchmark.cpp bitbase.cpp bitboard.cpp endgame.cpp evaluate.cpp >> CMakeLists.txt
-  - echo main.cpp material.cpp misc.cpp movegen.cpp movepick.cpp pawns.cpp position.cpp psqt.cpp >> CMakeLists.txt
-  - echo search.cpp thread.cpp timeman.cpp tt.cpp uci.cpp ucioption.cpp syzygy/tbprobe.cpp) >> CMakeLists.txt
-  - echo set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src) >> CMakeLists.txt
-#   - echo target_compile_options(stockfish PUBLIC "/Ox") >> CMakeLists.txt
+  - ps: |
+      # Get sources
+      $src = get-childitem -Path *.cpp -Recurse | select -ExpandProperty FullName
+      $src = $src -join ' '
+      $src = $src.Replace("\", "/")
+
+      # Build CMakeLists.txt
+      $t = 'cmake_minimum_required(VERSION 3.8)',
+           'project(Stockfish)',
+           'set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src)',
+           'set(source_files', $src, ')',
+           'add_executable(stockfish ${source_files})'
+
+      # Write CMakeLists.txt withouth BOM
+      $MyPath = (Get-Item -Path "." -Verbose).FullName + '\CMakeLists.txt'
+      $Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding $False
+      [System.IO.File]::WriteAllLines($MyPath, $t, $Utf8NoBomEncoding)
+
+      # Obtain bench reference from git log
+      $b = git log HEAD | sls "\b[Bb]ench[ :]+[0-9]{7}" | select -first 1
+      $bench = $b -match '\D+(\d+)' | % { $matches[1] }
+      Write-Host "Reference bench:" $bench
 
 build_script:
   - cmake -G "Visual Studio 14 2015 Win64" .
   - cmake --build .
 
 before_test:
-  - cd Debug
-  - stockfish.exe bench > null
+  - cd src/Debug
+  - ps: |
+      # Verify bench number
+      ./stockfish bench 2> out.txt 1> null
+      $s = (gc "./out.txt" | out-string)
+      $r = ($s -match 'Nodes searched \D+(\d+)' | % { $matches[1] })
+      Write-Host "Engine bench:" $r
+      Write-Host "Reference bench:" $bench
+      If ($r -ne $bench) { exit 1 }