Have configure raise an error when building on AtheOS. Code specific to AtheOS

will be removed in Python 2.7.

Misc/NEWS

@@ -868,6 +868,8 @@ Tools/Demos
 Build
 -----
 
+- Stop supporting AtheOS and cause a build error in configure for the platform.
+
 - Bug #1655392: don't add -L/usr/lib/pythonX.Y/config to the LDFLAGS
   returned by python-config if Python was built with --enable-shared
   because that prevented the shared library from being used.

README

@@ -669,7 +669,11 @@ Cygwin: With recent (relative to the time of writing, 2001-12-19)
         News regarding these platforms with more recent Cygwin
         versions would be appreciated!
 
-AtheOS: From Octavian Cerna <tavy at ylabs.com>:
+AtheOS: Official support has been stopped as of Python 2.6.  All code will be
+        removed in Python 2.7 unless a maintainer steps forward for this
+        platform.
+
+        From Octavian Cerna <tavy at ylabs.com>:
 
         Before building:
 

configure.in

@@ -450,7 +450,7 @@ AC_AIX
 
 # Check for unsupported systems
 case $ac_sys_system/$ac_sys_release in
-Linux*/1*)
+atheos*|Linux*/1*)
    echo This system \($ac_sys_system/$ac_sys_release\) is no longer supported.
    echo See README for details.
    exit 1;;