Fixed shader script

Author: walbourn

DirectXTex/Shaders/CompileShaders.cmd

@@ -17,7 +17,9 @@ if exist %PCFXC% goto continue
 set PCFXC=fxc.exe
 
 :continue
-@if %CompileShadersOutput%.==. set CompileShadersOutput=Compiled
+if not defined CompileShadersOutput (set CompileShadersOutput=Compiled) else (set CompileShadersOutput=%CompileShadersOutput%##
+set CompileShadersOutput=%CompileShadersOutput: ##=%
+set CompileShadersOutput=%CompileShadersOutput:##=%)
 @if not exist %CompileShadersOutput% mkdir %CompileShadersOutput%
 call :CompileShader BC7Encode TryMode456CS
 call :CompileShader BC7Encode TryMode137CS