Updated compiler script

DirectXTex/Shaders/CompileShaders.cmd

@@ -9,6 +9,16 @@ rem Copyright (c) Microsoft Corporation. All rights reserved.
 setlocal
 set error=0
 
+set PCFXC="%WindowsSdkBinPath%%WindowsSDKVersion%\x86\fxc.exe"
+if exist %PCFXC% goto continue
+set PCFXC="%WindowsSdkDir%bin\%WindowsSDKVersion%\x86\fxc.exe"
+if exist %PCFXC% goto continue
+set PCFXC="%WindowsSdkDir%bin\x86\fxc.exe"
+if exist %PCFXC% goto continue
+
+set PCFXC=fxc.exe
+
+:continue
 call :CompileShader BC7Encode TryMode456CS
 call :CompileShader BC7Encode TryMode137CS
 call :CompileShader BC7Encode TryMode02CS
@@ -30,7 +40,7 @@ endlocal
 exit /b
 
 :CompileShader
-set fxc=fxc /nologo %1.hlsl /Tcs_4_0 /Zi /Zpc /Qstrip_reflect /Qstrip_debug /E%2 /FhCompiled\%1_%2.inc /FdCompiled\%1_%2.pdb /Vn%1_%2
+set fxc=%PCFXC% /nologo %1.hlsl /Tcs_4_0 /Zi /Zpc /Qstrip_reflect /Qstrip_debug /E%2 /FhCompiled\%1_%2.inc /FdCompiled\%1_%2.pdb /Vn%1_%2
 echo.
 echo %fxc%
 %fxc% || set error=1