BLD: move + update build script (pandas-dev#14991)

Only one source dist format to upload since https://www.python.org/dev/peps/pep-0527/

Author: jorisvandenbossche

build_dist.sh renamed to scripts/build_dist.sh

@@ -12,7 +12,7 @@ case ${answer:0:1} in
         echo "Building distribution"
         python setup.py clean
         python setup.py build_ext --inplace
-        python setup.py sdist --formats=zip,gztar
+        python setup.py sdist --formats=gztar
     ;;
     * )
         echo "Not building distribution"