os2-buildbot.sh: Fix output directory.
diff --git a/build-scripts/os2-buildbot.sh b/build-scripts/os2-buildbot.sh
index a93796c..6316f91 100755
--- a/build-scripts/os2-buildbot.sh
+++ b/build-scripts/os2-buildbot.sh
@@ -19,7 +19,7 @@ ZIPFILE="$1"
if [ -z $1 ]; then
ZIPFILE=sdl-os2.zip
fi
-ZIPDIR=SDL2-os2
+ZIPDIR=buildbot
set -e
set -x