meson: build mpv.com with -Os

LLVM even in freestanding build required memset/memcpy/memmove to be
implemented. We don't use them directly but the calls are generated from
the code, which are later optimized away. Since this suppose to be small
utility application, we can always optimize it.

Fixes: #17664

Author: kasper93

meson.build

@@ -1855,7 +1855,7 @@ if get_option('cplayer')
     if win32
         if get_option('win32-subsystem') != 'console'
             wrapper_sources = 'osdep/win32-console-wrapper.c'
-            executable('mpv', wrapper_sources, c_args: ['-municode', '-fno-asynchronous-unwind-tables', '-fno-stack-protector'],
+            executable('mpv', wrapper_sources, c_args: ['-municode', '-fno-asynchronous-unwind-tables', '-fno-stack-protector', '-Os'],
                        link_args: ['-municode', '-nostartfiles', '-nodefaultlibs'],
                        override_options: ['b_sanitize=none'],
                        name_suffix: 'com', install: true)