RFR (M): Enable OpenJDK builds on Windows with MinGW/MSYS

[Jonathan Gibbons]

Volker,

This work is very interesting!

Have you looked at what changes might be necessary to any shell tests in 
the langtools/test and jdk/test directories?

Many test shell scripts have a block of code of the form:


OS=`uname -s`
case "$OS" in
     SunOS | Linux | *BSD | Darwin )
         NULL=/dev/null
         PATHSEP=":"
         FILESEP="/"
         TMP=/tmp
         ;;
     CYGWIN* )
         NULL=/dev/null
         PATHSEP=";"
         FILESEP="/"
         TMP=/tmp
         ;;
     Windows* )
         NULL=NUL
         PATHSEP=";"
         FILESEP="\\"
         TMP=$TEMP
         ;;
     * )
         echo "Unrecognized system!"
         exit 1;
         ;;
esac


What would the equivalent case statement be for minGW/MSYS?

-- Jon