Comment extending INCLUDE env variable

Author: antonwolfy

conda-recipe/bld.bat

@@ -1,6 +1,6 @@
 :: A workaround for activate-dpcpp.bat issue to be addressed in 2021.4
 set "LIB=%BUILD_PREFIX%\Library\lib;%BUILD_PREFIX%\compiler\lib;%LIB%"
-set "INCLUDE=%BUILD_PREFIX%\include;%INCLUDE%"
+:: set "INCLUDE=%BUILD_PREFIX%\include;%INCLUDE%"
 
 :: Treat warnings from the INCLUDE as external (a part of the above workaround)
 :: The warning from the DPC++ compiler will be suppressed then