* builds/meson/*.py: Fix name of python executable for auxiliary scripts. The previous change to check the return code of `run_command` invocations caused the CI to fail. Although most scripts used `python_exe` as the program command, the script to determine the project version did not. But, all scripts used `python` as the shebang, and this is not available on all systems. Particularly Debian does not provide a `python` command, though `python3` does exist. This meant that formerly the version number was lacking, and now the build simply fails. Instead, rely on `python3` since it is guaranteed to exist when running meson, and `python2` is end of life anyway.
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diff --git a/builds/meson/extract_freetype_version.py b/builds/meson/extract_freetype_version.py
index ab79fdb..fa83e9d 100644
--- a/builds/meson/extract_freetype_version.py
+++ b/builds/meson/extract_freetype_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
diff --git a/builds/meson/extract_libtool_version.py b/builds/meson/extract_libtool_version.py
index 4527f11..0ab704e 100644
--- a/builds/meson/extract_libtool_version.py
+++ b/builds/meson/extract_libtool_version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
diff --git a/builds/meson/generate_reference_docs.py b/builds/meson/generate_reference_docs.py
index 15d9b06..746518f 100644
--- a/builds/meson/generate_reference_docs.py
+++ b/builds/meson/generate_reference_docs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
diff --git a/builds/meson/parse_modules_cfg.py b/builds/meson/parse_modules_cfg.py
index aa6e9e1..45b65a5 100644
--- a/builds/meson/parse_modules_cfg.py
+++ b/builds/meson/parse_modules_cfg.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 by
# David Turner, Robert Wilhelm, and Werner Lemberg.
diff --git a/builds/meson/process_ftoption_h.py b/builds/meson/process_ftoption_h.py
index fe60887..7dfb7c5 100644
--- a/builds/meson/process_ftoption_h.py
+++ b/builds/meson/process_ftoption_h.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) 2020-2021 by
# David Turner, Robert Wilhelm, and Werner Lemberg.