meson: Fix meson version assertion

[brlin-tw]

Currently meson.build asserts meson >= 0.44.0 however it seems to be
using features introducing in meson 0.46.0, thus spewing the following
warning messages:

WARNING: Project targetting '>= 0.44.0' but tried to use feature
introduced in '0.46.0': compiler.get_supported_link_arguments_method
WARNING: Project targetting '>= 0.44.0' but tried to use feature
introduced in '0.46.0': compiler.has_link_argument
WARNING: Project targetting '>= 0.44.0' but tried to use feature
introduced in '0.46.0': compiler.has_multi_link_argument
<stripped>
WARNING: Project specifies a minimum meson_version '>= 0.44.0' but uses
features which were added in newer versions:
* 0.46.0: {'compiler.get_supported_link_arguments_method',
'compiler.has_multi_link_argument', 'compiler.has_link_argument'}

This patch fixes the issue by bumping the version assertion to >=
0.46.0.

This patch is based on mere speculation and is NOT TESTED, please
review.

Signed-off-by: 林博仁(Buo-ren Lin) Buo.Ren.Lin@gmail.com

[ebassi]

Thanks for your contribution!

It's not really enough to just bump up the required version; in src/meson.build we're also doing a version check for 0.46 functionality.

It's also safe to update the minimum version to 0.47, which is one release behind the latest stable release of Meson.

I've opened #192 with the required changes.

Thanks again!