[glib: 1/2] Revert "meson: simplify lookup of python command"

[Philip Withnall <pwithnall src gnome org>]

commit 9e38cffdfc96d4f23fd8644140469e48cc1920a1
Author: Philip Withnall <pwithnall endlessos org>
Date:   Mon Mar 21 13:17:32 2022 +0000

    Revert "meson: simplify lookup of python command"
    
    This reverts commit 4a4d9eb6624b69328fa9749236c0b4236932ceb8.
    
    It seems to cause build failures with `VsDevCmd.bat` 2022:
    ```
    ..\meson.build:2274:0: ERROR: Command "C:\Program Files\Meson\meson.exe runpython --version" failed with 
status 2.
    ```
    
    Revert it for now until this can be fixed in Meson.
    
    See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2541#note_1410521

 meson.build | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 22220cd65f..7dc6ff874a 100644
--- a/meson.build
+++ b/meson.build
@@ -2271,10 +2271,16 @@ endif
 
 glib_conf.set('HAVE_PROC_SELF_CMDLINE', have_proc_self_cmdline)
 
-python = find_program('python3', version: '>=3.5')
+python = import('python').find_installation('python3')
 # used for '#!/usr/bin/env <name>'
 python_name = 'python3'
 
+python_version = python.language_version()
+python_version_req = '>=3.5'
+if not python_version.version_compare(python_version_req)
+  error('Requires Python @0@, @1@ found.'.format(python_version_req, python_version))
+endif
+
 # Determine which user environment-dependent files that we want to install
 have_bash = find_program('bash', required : false).found() # For completion scripts
 bash_comp_dep = dependency('bash-completion', version: '>=2.0', required: false)