patch/meson: fix meson.mk with python3

patches/packages/backport/0003-meson-fix-python-python-to-python3.patch

+From c371b302a5796d9c240e6aefa4fabcead79a7fbf Mon Sep 17 00:00:00 2001
+From: Jan Pavlinec <jan.pavlinec@nic.cz>
+Date: Wed, 8 Apr 2020 12:59:24 +0200
+Subject: [PATCH] meson: fix python python to python3
+
+---
+ devel/meson/meson.mk | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/devel/meson/meson.mk b/devel/meson/meson.mk
+index 16c6b16..a93ae77 100644
+--- a/devel/meson/meson.mk
++++ b/devel/meson/meson.mk
+@@ -37,7 +37,7 @@ MESON_VARS:=
+ MESON_ARGS:=
+ 
+ define Meson
+-	$(2) $(STAGING_DIR_HOST)/bin/$(PYTHON) $(MESON_DIR)/meson.py $(1)
++	$(2) $(STAGING_DIR_HOSTPKG)/bin/python3 $(MESON_DIR)/meson.py $(1)
+ endef
+ 
+ define Meson/CreateNativeFile
+-- 
+2.17.1
+