zstd: fix compilation without host distutils

This is the case in debian.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

utils/zstd/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zstd
 PKG_VERSION:=1.4.5
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.zst
 PKG_SOURCE_URL:=https://github.com/facebook/zstd/releases/download/v$(PKG_VERSION)

utils/zstd/patches/010-python.patch

@@ -0,0 +1,21 @@
+--- a/build/meson/meson.build
++++ b/build/meson/meson.build
+@@ -22,7 +22,6 @@ project('zstd',
+ cc = meson.get_compiler('c')
+ cxx = meson.get_compiler('cpp')
+ pkgconfig = import('pkgconfig')
+-python3 = import('python').find_installation()
+ windows_mod = import('windows')
+ 
+ host_machine_os = host_machine.system()
+@@ -40,8 +39,8 @@ compiler_msvc = 'msvc'
+ zstd_version = meson.project_version()
+ 
+ zstd_h_file = join_paths(meson.current_source_dir(), '../../lib/zstd.h')
+-GetZstdLibraryVersion_py = files('GetZstdLibraryVersion.py')
+-r = run_command(python3, GetZstdLibraryVersion_py, zstd_h_file)
++GetZstdLibraryVersion_py = find_program('GetZstdLibraryVersion.py', native : true)
++r = run_command(GetZstdLibraryVersion_py, zstd_h_file)
+ if r.returncode() == 0
+   zstd_version = r.stdout().strip()
+   message('Project version is now: @0@'.format(zstd_version))