meson: simplify install_megadrivers.py invocation

Note: `find_program()` needs a shebang on scripts.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

bin/install_megadrivers.py

@@ -1,5 +1,6 @@
+#!/usr/bin/env python3
 # encoding=utf-8
-# Copyright © 2017-2018 Intel Corporation
+# Copyright 2017-2018 Intel Corporation
 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal

bin/meson.build

@@ -20,3 +20,4 @@
 
 git_sha1_gen_py = files('git_sha1_gen.py')
 symbols_check = find_program('symbols-check.py')
+install_megadrivers_py = find_program('install_megadrivers.py')

src/gallium/targets/dri/meson.build

@@ -110,8 +110,7 @@ foreach d : [[with_gallium_kmsro, [
 endforeach
 
 meson.add_install_script(
-  prog_python.path(),
-  join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
+  install_megadrivers_py.path(),
   libgallium_dri.full_path(),
   dri_drivers_path,
   gallium_dri_drivers,

src/gallium/targets/va/meson.build

@@ -65,8 +65,7 @@ foreach d : [[with_gallium_r600, 'r600'],
 endforeach
 
 meson.add_install_script(
-  prog_python.path(),
-  join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
+  install_megadrivers_py.path(),
   libva_gallium.full_path(),
   va_drivers_path,
   va_drivers,

src/gallium/targets/vdpau/meson.build

@@ -71,8 +71,7 @@ foreach d : [[with_gallium_r300, 'r300'],
 endforeach
 
 meson.add_install_script(
-  prog_python.path(),
-  join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
+  install_megadrivers_py.path(),
   libvdpau_gallium.full_path(),
   vdpau_drivers_path,
   vdpau_drivers,

src/gallium/targets/xvmc/meson.build

@@ -60,8 +60,7 @@ foreach d : [[with_gallium_r600, 'r600'], [with_gallium_nouveau, 'nouveau']]
 endforeach
 
 meson.add_install_script(
-  prog_python.path(),
-  join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
+  install_megadrivers_py.path(),
   libxvmc_gallium.full_path(),
   xvmc_drivers_path,
   xvmc_drivers,

src/mesa/drivers/dri/meson.build

@@ -74,8 +74,7 @@ if _dri_drivers != []
   )
 
   meson.add_install_script(
-    prog_python.path(),
-    join_paths(meson.source_root(), 'bin/install_megadrivers.py'),
+    install_megadrivers_py.path(),
     libmesa_dri_drivers.full_path(),
     dri_drivers_path,
     _dri_link,