Print gradle output on compiling

Enable the attribute "console" of custom_target() introduced in meson
0.48. This allows to get a feedback of what gradle does (which can takes
a very long time).

This produces warnings because we declare to support meson >= 0.37, but
we don't want to stop supporting older versions for that. Older versions
just ignore the option:

> WARNING: Unknown keyword arguments in target scrcpy-server: console

Newer meson versions use it, but warn because we declare supporting
older versions:

> WARNING: Project targetting '>= 0.37' but tried to use feature
> introduced in '0.48.0': console arg in custom_target

Meson does not support conditional branches to suppress such warnings,
so just keep the warnings.

server/meson.build

@@ -6,6 +6,7 @@ if prebuilt_server == ''
                   build_always: true,  # gradle is responsible for tracking source changes
                   output: 'scrcpy-server.jar',
                   command: [find_program('./scripts/build-wrapper.sh'), meson.current_source_dir(), '@OUTPUT@', get_option('buildtype')],
+                  console: true,
                   install: true,
                   install_dir: 'share/scrcpy')
 else