Revert "Pass /useenv to vcbuild so that rc and link find SDK headers and libs"

It breaks on a clean installs of Windows, and registration of SDK with Visual
Studio seems to be the answer.

This reverts commit f3f6c9be.

Conflicts:

	lcms2/makefile.mk

lcms2/makefile.mk

@@ -55,7 +55,7 @@ BUILD_DIR=Projects/VC2010/lcms2_DLL
 .IF "$(CCNUMVER)" >= "001600000000"
 BUILD_ACTION=MSBuild.exe lcms2_DLL.vcxproj /p:Configuration=Release /p:Platform=Win32
 .ELSE
-BUILD_ACTION=$(COMPATH)$/vcpackages$/vcbuild.exe /useenv lcms2_DLL.vcproj "Release|Win32"
+BUILD_ACTION=$(COMPATH)$/vcpackages$/vcbuild.exe lcms2_DLL.vcproj "Release|Win32"
 .ENDIF
 
 .ELSE #"$(GUI)$(COM)"!="WNTMSC"