meson: do not try to substitute the prefix in python supplied paths

The prefix should be correct in the first place, and substitution breaks
with our custom patched Python.

(From OE-Core rev: ad1d0187aed457e4b5bd1c0d11b39141786bc9fd)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/meson/meson.inc

@@ -16,6 +16,7 @@ SRC_URI = "https://github.com/mesonbuild/meson/releases/download/${PV}/meson-${P
            file://0001-environment.py-detect-windows-also-if-the-system-str.patch \
            file://0001-mesonbuild-environment.py-do-not-determine-whether-a.patch \
            file://0001-mesonbuild-environment.py-check-environment-for-vari.patch \
+           file://0001-modules-python.py-do-not-substitute-python-s-install.patch \
            "
 SRC_URI[sha256sum] = "2a1bc42dda58206fb922cda5e1ca95cc03ad126321d26acc47d3493ec4e7021f"
 SRC_URI[md5sum] = "433483107fda4616eaf33de7e7083a84"

meta/recipes-devtools/meson/meson/0001-Make-CPU-family-warnings-fatal.patch

@@ -1,4 +1,4 @@
-From f76d2bf09f7ffd871d068c4ac4c4be083f5fb07f Mon Sep 17 00:00:00 2001
+From 1ec44c955f45f3787aaf92edd70dec5bcf03f665 Mon Sep 17 00:00:00 2001
 From: Ross Burton <ross.burton@intel.com>
 Date: Tue, 3 Jul 2018 13:59:09 +0100
 Subject: [PATCH] Make CPU family warnings fatal
@@ -12,7 +12,7 @@ Signed-off-by: Ross Burton <ross.burton@intel.com>
  2 files changed, 2 insertions(+), 4 deletions(-)
 
 diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
-index f2510c1..b9841fe 100644
+index 5309ef4..3f0a399 100644
 --- a/mesonbuild/envconfig.py
 +++ b/mesonbuild/envconfig.py
 @@ -178,7 +178,7 @@ class MachineInfo:
@@ -25,7 +25,7 @@ index f2510c1..b9841fe 100644
          endian = literal['endian']
          if endian not in ('little', 'big'):
 diff --git a/mesonbuild/environment.py b/mesonbuild/environment.py
-index 4c1c5ac..a5a7461 100644
+index 3031a82..ecd18d0 100644
 --- a/mesonbuild/environment.py
 +++ b/mesonbuild/environment.py
 @@ -242,9 +242,7 @@ def detect_cpu_family(compilers):

meta/recipes-devtools/meson/meson/0001-modules-python.py-do-not-substitute-python-s-install.patch

@@ -0,0 +1,44 @@
+From 1d178fb2928d325e339b15972890ceced863d3ec Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Thu, 18 Apr 2019 17:36:11 +0200
+Subject: [PATCH] modules/python.py: do not substitute python's install prefix
+ with meson's
+
+Not sure why this is being done, but it
+a) relies on Python's internal variable substitution which may break in the future
+b) shouldn't be necessary as Python's prefix ought to be correct in the first place
+
+Upstream-Status: Pending
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ mesonbuild/modules/python.py | 7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+diff --git a/mesonbuild/modules/python.py b/mesonbuild/modules/python.py
+index 6e2c63b..f5a37ac 100644
+--- a/mesonbuild/modules/python.py
++++ b/mesonbuild/modules/python.py
+@@ -254,7 +254,7 @@ import sysconfig
+ import json
+ import sys
+ 
+-install_paths = sysconfig.get_paths(scheme='posix_prefix', vars={'base': '', 'platbase': '', 'installed_base': ''})
++install_paths = sysconfig.get_paths(scheme='posix_prefix')
+ 
+ def links_against_libpython():
+     from distutils.core import Distribution, Extension
+@@ -279,12 +279,11 @@ class PythonInstallation(ExternalProgramHolder):
+         ExternalProgramHolder.__init__(self, python)
+         self.interpreter = interpreter
+         self.subproject = self.interpreter.subproject
+-        prefix = self.interpreter.environment.coredata.get_builtin_option('prefix')
+         self.variables = info['variables']
+         self.paths = info['paths']
+         install_paths = info['install_paths']
+-        self.platlib_install_path = os.path.join(prefix, install_paths['platlib'][1:])
+-        self.purelib_install_path = os.path.join(prefix, install_paths['purelib'][1:])
++        self.platlib_install_path = install_paths['platlib']
++        self.purelib_install_path = install_paths['purelib']
+         self.version = info['version']
+         self.platform = info['platform']
+         self.is_pypy = info['is_pypy']

meta/recipes-devtools/meson/meson/0002-Support-building-allarch-recipes-again.patch

@@ -1,4 +1,4 @@
-From 755902910ad124095c671b3c7f057e6513d9c0c6 Mon Sep 17 00:00:00 2001
+From a4bce582c1f13f48b329526aa81710405c4c691e Mon Sep 17 00:00:00 2001
 From: Peter Kjellerstedt <pkj@axis.com>
 Date: Thu, 26 Jul 2018 16:32:49 +0200
 Subject: [PATCH] Support building allarch recipes again
@@ -13,7 +13,7 @@ Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
  1 file changed, 1 insertion(+)
 
 diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
-index b9841fe..9c0487e 100644
+index 3f0a399..4509e09 100644
 --- a/mesonbuild/envconfig.py
 +++ b/mesonbuild/envconfig.py
 @@ -34,6 +34,7 @@ from . import mlog