games/gtkradiant: unbreak with libc++ 8

In file included from plugins/archivepak/plugin.cpp:24:
In file included from include/iarchive.h:25:
In file included from /usr/include/c++/v1/cstddef:38:
include/version:1:1: error: expected unqualified-id
1.5.0
^

PR:		236192
Approved by:	portmgr blanket

games/gtkradiant/files/patch-makeversion.py

@@ -11,6 +11,16 @@
  
  def get_version():
    # version
+@@ -68,9 +66,6 @@ def radiant_makeversion(append_about):
+   f = open('include/RADIANT_MAJOR', 'w')
+   f.write(major)
+   f.close()
+-  f = open('include/version', 'w')
+-  f.write(line)
+-  f.close()
+   # aboutmsg
+   aboutfile = 'include/aboutmsg.default'
+   if ( os.environ.has_key('RADIANT_ABOUTMSG') ):
 @@ -82,7 +80,7 @@
      line = f.readline()
      f.close()