a couple other sunos4 support items removed

Doc/lib/libsun.tex

@@ -2,5 +2,4 @@
 \label{sunos}
 
 The modules described in this chapter provide interfaces to features
-that are unique to the SunOS operating system (versions 4 and 5; the
-latter is also known as Solaris version 2).
+that are unique to SunOS 5 (also known as Solaris version 2).

setup.py

@@ -655,12 +655,8 @@ class PyBuildExt(build_ext):
                 exts.append( Extension('nis', ['nismodule.c'],
                                        libraries = libs) )
 
-        # Curses support, requring the System V version of curses, often
+        # Curses support, requiring the System V version of curses, often
         # provided by the ncurses library.
-        if platform == 'sunos4':
-            inc_dirs += ['/usr/5include']
-            lib_dirs += ['/usr/5lib']
-
         if (self.compiler.find_library_file(lib_dirs, 'ncurses')):
             curses_libs = ['ncurses']
             exts.append( Extension('_curses', ['_cursesmodule.c'],