[glib] Use env to run the Python-based tools

[Emmanuele Bassi <ebassi src gnome org>]

commit 4395a8977727e2c569b472dbe8710ffb87c219e2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Jul 14 21:21:33 2017 +0100

    Use env to run the Python-based tools
    
    Otherwise overriding the Python interpreter with `--with-python` won't
    work correctly.

 gobject/glib-genmarshal.in |    2 +-
 gobject/glib-mkenums.in    |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gobject/glib-genmarshal.in b/gobject/glib-genmarshal.in
index 9a39a53..6ce33d0 100755
--- a/gobject/glib-genmarshal.in
+++ b/gobject/glib-genmarshal.in
@@ -1,4 +1,4 @@
-#!@PYTHON@
+#!/usr/bin/env @PYTHON@
 
 # pylint: disable=too-many-lines, missing-docstring, invalid-name
 
diff --git a/gobject/glib-mkenums.in b/gobject/glib-mkenums.in
index 6aaef58..87f81cf 100755
--- a/gobject/glib-mkenums.in
+++ b/gobject/glib-mkenums.in
@@ -1,4 +1,4 @@
-#!@PYTHON@
+#!/usr/bin/env @PYTHON@
 
 # If the code below looks horrible and unpythonic, do not panic.
 #