Delete Visual Studio build files

There's no need for VS build files.
Besides, update scripts/update.sh to post-edit source/configure
for missing test/ directory.

This clean up is necessary to get 'git cl upload/rietveld' work
smoothly in an upcoming ICU update.

BUG=637001
TEST=source/runConfigureICU Linux --disable-tests --disable-layout

Review URL: https://codereview.chromium.org/2443653002 .
127 files changed