mesa: add python3-packaging to host dependencies

Mesa 25.2.4 configuration fails on Python 3.14+ because 'distutils'
has been removed. Adding 'packaging' ensures the version check
for Mako succeeds without falling back to the missing distutils.

Relates to #61

Signed-off-by: Tito Brasolin <tito.brasolin@gmail.com>

Author: titobrasolin

libs/mesa/host-pip-requirements.txt

@@ -1,5 +1,6 @@
 Mako==1.3.5 --hash=sha256:48dbc20568c1d276a2698b36d968fa76161bf127194907ea6fc594fa81f943bc
 MarkupSafe==2.1.5 --hash=sha256:d283d37a890ba4c1ae73ffadf8046435c76e7bc2247bbb63c00bd1a709c6544b
+packaging==26.0 --hash=sha256:00243ae351a257117b6a241061796684b084ed1c516a08c48a3f7e147a9d80b4
 ply==3.11 --hash=sha256:00c7c1aaa88358b9c765b6d3000c6eec0ba42abca5351b095321aef446081da3
 pycparser==2.21 --hash=sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206
 PyYAML==6.0.2 --hash=sha256:d584d9ec91ad65861cc08d42e834324ef890a082e591037abe114850ff7bbc3e