Yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils…

Yet another emergency fix for #13803 bootstrap issue: Under Solaris, distutils doesn't include bitness in the directory name

Lib/sysconfig.py

@@ -582,6 +582,11 @@ def get_platform():
         if release[0] >= "5":           # SunOS 5 == Solaris 2
             osname = "solaris"
             release = "%d.%s" % (int(release[0]) - 3, release[2:])
+            # We can't use "platform.architecture()[0]" because a
+            # bootstrap problem. We use a dict to get an error
+            # if some suspicious happens.
+            bitness = {2147483647:"32bit", 9223372036854775807:"64bit"}
+            machine += ".%s" % bitness[sys.maxint]
         # fall through to standard osname-release-machine representation
     elif osname[:4] == "irix":              # could be "irix64"!
         return "%s-%s" % (osname, release)