Fix noconsole.exe

The linker flag "-mwindows" has no effect on my current MinGW.

Instead, passing "-Wl,--subsystem,windows" works.

Fixes <https://github.com/Genymobile/scrcpy/issues/691>

app/meson.build

@@ -123,10 +123,8 @@ configure_file(configuration: conf, output: 'config.h')
 src_dir = include_directories('src')
 
 if get_option('windows_noconsole')
-    c_args = [ '-mwindows' ]
-    link_args = [ '-mwindows' ]
+    link_args = [ '-Wl,--subsystem,windows' ]
 else
-    c_args = []
     link_args = []
 endif
 
@@ -134,7 +132,7 @@ executable('scrcpy', src,
            dependencies: dependencies,
            include_directories: src_dir,
            install: true,
-           c_args: c_args,
+           c_args: [],
            link_args: link_args)
 
 install_man('scrcpy.1')