make dist now uses unix/build/makedist.sh on all platforms.
That calls distfilelist.sh to build the list of files to include, and
tars them up into ../filename-as-it-used-to-be.tar.gz.

make distmsi does the same thing, only it doesn't call tar but
build/package/msi/makemsi.sh. And we don't use the guid.txt file for msi
anymore.

As discussed, we have to check that the tar -T inputfilenames.txt works
on all platforms.

Example from current CVS:
67642880 May 17 14:37 ../root_v5.11.03.win32.debug.msi
67672080 May 17 12:52 ../root_v5.11.03.win32.debug.tar.gz

This patch also contains a little fix for w32pragma.h to be compatible
with python MSVC8 builds.


git-svn-id: http://root.cern.ch/svn/root/trunk@15086 27541ba8-7e3a-0410-8455-c3a389f83636