Correct use ERRORLEVEL in conda scripts for Windows (#28)

* Correct use of ERRORLEVEL in cmd scripts.

* Reset 0 after oneAPI env activateion in build and test scripts.

* Revert "Correct use of ERRORLEVEL in cmd scripts."

This reverts commit b42a7e1.

Author: PokhodenkoSA

conda-recipe/bld.bat

@@ -1,4 +1,8 @@
 call "%ONEAPI_ROOT%compiler\latest\env\vars.bat"
+IF ERRORLEVEL 1 exit 1
+REM conda uses %ERRORLEVEL% but FPGA scripts can set it. So it should be reseted.
+set ERRORLEVEL=
+
 set "CC=dpcpp-cl.exe"
 set "CXX=dpcpp-cl.exe"
 

conda-recipe/run_test.bat

@@ -1,5 +1,7 @@
 call "%ONEAPI_ROOT%/compiler/latest/env/vars.bat"
-IF %ERRORLEVEL% NEQ 0 exit 1
+IF ERRORLEVEL 1 exit 1
+REM conda uses %ERRORLEVEL% but FPGA scripts can set it. So it should be reseted.
+set ERRORLEVEL=
 
 @echo on