mono: switch to python3

srcpkgs/mono/patches/fix-heapviz-import.patch

@@ -0,0 +1,11 @@
+--- scripts/mono-heapviz.orig
++++ scripts/mono-heapviz
+@@ -7,7 +7,7 @@
+ 
+ from __future__ import print_function
+ import sys, os
+-import Image, ImageDraw
++from PIL import Image, ImageDraw
+ from xml.sax import ContentHandler, make_parser
+ from xml.sax.handler import feature_namespaces
+ from optparse import OptionParser

srcpkgs/mono/template

@@ -1,13 +1,13 @@
 # Template file for 'mono'
 pkgname=mono
 version=6.0.0.327
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--disable-system-aot"
 # XXX: figure out how to split this up into subpkgs.
-hostmakedepends="perl python cmake"
+hostmakedepends="perl python3 cmake"
 makedepends="zlib-devel libX11-devel libgdiplus-devel"
-depends="ca-certificates python"
+depends="ca-certificates python3-Pillow"
 short_desc="Free implementation of the .NET platform including runtime and compiler"
 maintainer="Helmut Pozimski <helmut@pozimski.eu>"
 license="MIT, BSD-3-Clause, GPL-2.0-or-later, LGPL-2.0-or-later, MPL-1.1"
@@ -15,6 +15,7 @@ homepage="https://www.mono-project.com"
 distfiles="https://download.mono-project.com/sources/mono/${pkgname}-${version}.tar.xz"
 checksum=f51184ce4b90c93fc2bf5ca02775dd2a1ea023e056089d286ea72f1c68586442
 lib32disabled=yes
+python_version="3"
 
 case "$XBPS_TARGET_MACHINE" in
 	*-musl) configure_args+=" --disable-boehm --without-sigaltstack" ;;