When detecting the Visual Studio environment, we check for the variables
$LIB and $INCLUDE. However, on Windows, environment variables are not
case sensitive.
Most of the time, these are named $LIB and $INCLUDE, but sometimes they
are named $lib and $include instead. Currently, we fail if this is the case.
I made a simple fix to cover this case. Ideally, we'd like to have
proper, full support of case insensitivity. Unfortunately, that is hard
to fix and the current lines are the result of much blood and tears. I'm
not very much inclined to try to "improve" them.
Bug: https://bugs.openjdk.java.net/browse/JDK-8068735
WebRev:
http://cr.openjdk.java.net/~ihse/JDK-8068735-support-lowercase-vs-env/webrev.01
/Magnus
