PEP 600: Small updates in response to Paul's feedback (#1191)

1. Note that the auditwheel project will maintain docs
2. Note that we'll update the old PEPs to note that they've been replaced
3. In compatibility logic, check for compatibility before checking for overrides

See: https://discuss.python.org/t/pep-600-future-manylinux-platform-tags-for-portable-linux-built-distributions/2414/4

pep-0600.rst

@@ -181,7 +181,8 @@ packages to break.
 Any method of producing wheels which meets these criteria is
 acceptable. However, in practice we expect that the auditwheel project
 will maintain an up-to-date set of tools and build images for
-producing manylinux wheels, and that most maintainers will want to use
+producing manylinux wheels, as well as documentation about how they
+work and how to use them, and that most maintainers will want to use
 those. For the latest information on building manylinux wheels,
 including recommendations about which build images to use, see
 https://packaging.python.org.
@@ -252,7 +253,9 @@ This redefinition is largely a no-op, but does affect a few things:
 - Previously, we had an open-ended and growing commitment to keep
   updating every manylinux PEP whenever a new Linux distro was
   released, for the rest of time. By making this PEP normative for the
-  older tags, that obligation goes away.
+  older tags, that obligation goes away. When this PEP is accepted,
+  the previous manylinux PEPs will receive a final update noting that
+  they are no longer maintained and referring to this PEP.
 
 - The "play well with others" rule was always intended, but previous
   PEPs didn't state it explicitly; now it's explicit.
@@ -322,6 +325,15 @@ semantics::
       tag_major = int(tag_major_str)
       tag_minor = int(tag_minor_str)
 
+      if not system_uses_glibc():
+          return False
+      sys_major, sys_minor = get_system_glibc_version()
+      if (sys_major, sys_minor) < (tag_major, tag_minor):
+          return False
+      sys_arch = get_system_arch()
+      if sys_arch != tag_arch:
+          return False
+
       # Check for manual override
       try:
           import _manylinux
@@ -342,13 +354,7 @@ semantics::
                   if hasattr(_manylinux, "manylinux2010_compatible"):
                       return bool(_manylinux.manylinux2010_compatible)
 
-      # Fall back on autodetection. See the pip source code for
-      # ideas on how to implement the helper functions.
-      if not system_uses_glibc():
-          return False
-      sys_major, sys_minor = get_system_glibc_version()
-      sys_arch = get_system_arch()
-      return (sys_major, sys_minor) >= (tag_major, tag_minor) and sys_arch == tag_arch
+      return True
 
 
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