do not use the WINSTORECOMPAT define for VLC sources

We don't need this hack anymore. We call the proper API's available in
UWP when needed.

However we still need to link with windowsappcompat as libunwind is calling
RtlRestoreContext(), regardless if we're building for UWP or not.

configure.ac

@@ -417,9 +417,6 @@ AS_IF([test "${SYS}" = "mingw32"],[
   AS_IF([test "${enable_winstore_app}" = "yes"], [
     vlc_winstore_app=1
     LIBCOM="-loleaut32"
-    AX_APPEND_FLAG([-DWINSTORECOMPAT],[CFLAGS])
-    AX_APPEND_FLAG([-DWINSTORECOMPAT],[CPPFLAGS])
-    AX_APPEND_FLAG([-DWINSTORECOMPAT],[CXXFLAGS])
     LDFLAGS="${LDFLAGS} -lwindowsappcompat"
     VLC_ADD_LIBS([libvlccore], [-lruntimeobject])
     AC_LIBOBJ([gai_strerror])

meson.build

@@ -434,7 +434,6 @@ ucrt_version_test = '''
     # Check if we are building for Windows Store
     if get_option('winstore_app')
         have_win_store = true
-        add_project_arguments('-DWINSTORECOMPAT', language: ['c', 'cpp'])
         windowsappcompat_lib = cc.find_library('windowsappcompat')
         # TODO: enable when meson 0.63 is required
         # add_project_dependencies(windowsappcompat_lib, language: ['c', 'cpp'])