[gobject-introspection/gir-msvc-fix] meson: add back /usr/bin/env to the python-cmd. Fixes #237

[Christoph Reiter <creiter src gnome org>]

commit c44d14040fc3a848299f000f559513d2e4f96340
Author: Havard Graff <havard pexip com>
Date:   Thu Oct 18 15:54:24 2018 +0200

    meson: add back /usr/bin/env to the python-cmd. Fixes #237
    
    From nirbheek:
    "The shebang parsing goes like this: everything before the first space is
    the interpreter, everything after that is a single argument to that
    interpreter. So in meson, if the interpreter in the shebang is `env`,
    we ignore it and slurp the rest as the actual interpreter and parse it
    with shell syntax to handle spaces correctly.
    
    IIRC the py.exe python launcher on windows also knows that it should
    ignore /usr/bin/env and look at the rest to find the actual interpreter
    you want to use."

 tools/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/meson.build b/tools/meson.build
index b45ce668..3d5c0044 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -10,7 +10,7 @@ if get_option('doctool')
 endif
 
 if cc.get_id() == 'msvc'
-  python_cmd = python.get_variable('prefix') + '\\python.exe'
+  python_cmd = '/usr/bin/env ' + python.get_variable('prefix') + '\\python.exe'
 else
   python_cmd = '/usr/bin/env python@0@'.format(python.language_version().split('.')[0])
 endif