lang/python27 on macOS 11.0.1/arm ("Apple Silicon")

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

Trying to build lang/python27 fails with
	configure: error: Unexpected output of 'arch' on OSX

The attached trivial patch makes it build, but then packaging fails because 
lib_dynload/{bz2,zlib}.so are missing.

Unfortunately, gnome-doc-utils indirectly depends on Python 2.7.

? work
Index: patches/patch-configure
===================================================================
RCS file: /cvsroot/pkgsrc/lang/python27/patches/patch-configure,v
retrieving revision 1.1
diff -u -r1.1 patch-configure
--- patches/patch-configure	17 Jun 2018 19:21:21 -0000	1.1
+++ patches/patch-configure	9 Dec 2020 16:24:21 -0000
@@ -6,8 +6,8 @@
 - honor pkgsrc LDFLAGS
 - other stuff not previously commented (XXX)
 
---- configure.orig	2018-04-29 22:47:33.000000000 +0000
-+++ configure
+--- configure.orig	2020-04-19 23:13:39.000000000 +0200
++++ configure	2020-12-09 17:03:36.000000000 +0100
 @@ -3356,7 +3356,7 @@ case $ac_sys_system/$ac_sys_release in
    # Reconfirmed for OpenBSD 3.3 by Zachary Hamm, for 3.4 by Jason Ish.
    # In addition, Stefan Krah confirms that issue #1244610 exists through
@@ -57,7 +57,17 @@
          then
              # OS X 10.3 through 10.5
              cur_target=10.3
-@@ -8617,9 +8615,9 @@ then
+@@ -8474,6 +8472,9 @@ fi
+     	ppc)
+     		MACOSX_DEFAULT_ARCH="ppc64"
+     		;;
++	arm64)
++		MACOSX_DEFAULT_ARCH="arm64"
++		;;
+     	*)
+     		as_fn_error $? "Unexpected output of 'arch' on OSX" "$LINENO" 5
+     		;;
+@@ -8624,9 +8625,9 @@ then
  			LDCXXSHARED="$LDCXXSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
  		else
  			# No framework, use the Python app as bundle-loader
@@ -70,7 +80,7 @@
  		fi ;;
  	Darwin/*)
  		# Use -undefined dynamic_lookup whenever possible (10.3 and later).
-@@ -8642,9 +8640,9 @@ then
+@@ -8649,9 +8650,9 @@ then
  				LDCXXSHARED="$LDCXXSHARED "'$(PYTHONFRAMEWORKPREFIX)/$(PYTHONFRAMEWORKDIR)/Versions/$(VERSION)/$(PYTHONFRAMEWORK)'
  			else
  				# No framework, use the Python app as bundle-loader
@@ -83,7 +93,7 @@
  			fi
  		else
  			# building for OS X 10.3 and later
-@@ -8655,7 +8653,7 @@ then
+@@ -8662,7 +8663,7 @@ then
  		;;
  	Linux*|GNU*|QNX*)
  		LDSHARED='$(CC) -shared'
@@ -92,7 +102,7 @@
  	BSD/OS*/4*)
  		LDSHARED="gcc -shared"
  		LDCXXSHARED="g++ -shared";;
-@@ -8683,6 +8681,9 @@ then
+@@ -8690,6 +8691,9 @@ then
  				   ;;
  				esac
  		fi;;
@@ -102,7 +112,7 @@
  	NetBSD*|DragonFly*)
  		LDSHARED='$(CC) -shared'
  		LDCXXSHARED='$(CXX) -shared';;
-@@ -8729,7 +8730,8 @@ then
+@@ -8736,7 +8740,8 @@ then
  		 fi;;
  	Linux*|GNU*) CCSHARED="-fPIC";;
  	BSD/OS*/4*) CCSHARED="-fpic";;
@@ -112,7 +122,7 @@
  	OpenUNIX*|UnixWare*)
  		if test "$GCC" = "yes"
  		then CCSHARED="-fPIC"
-@@ -8781,11 +8783,12 @@ then
+@@ -8788,11 +8793,12 @@ then
  	OpenUNIX*|UnixWare*) LINKFORSHARED="-Wl,-Bexport";;
  	SCO_SV*) LINKFORSHARED="-Wl,-Bexport";;
  	ReliantUNIX*) LINKFORSHARED="-W1 -Blargedynsym";;
@@ -126,7 +136,7 @@
  	SunOS/5*) case $CC in
  		  *gcc*)
  		    if $CC -Xlinker --help 2>&1 | grep export-dynamic >/dev/null
-@@ -10798,6 +10801,10 @@ int
+@@ -10883,6 +10889,10 @@ int
  main ()
  {
  int x=kqueue()