MAINT: Remove numpy-macosx-installer and win32build directories.

The scripts in those directories were used to build windows superpacks
and mac dmg files. We now release wheels for both of those platforms.
There is little overhead maintaining these scripts, but they are clutter
and will eventually bit rot if not used for current systems. So remove
them.

Author: charris

.gitattributes

@@ -1,7 +1,3 @@
-# Line endings for Windows scripts
-* text=auto
-tools/win32build/nsis_scripts/*.nsi.in eol=crlf
-
 # Numerical data files
 numpy/lib/tests/data/*.npy binary