express: No need to check for -fvisibility=hidden twice

meson.build

@@ -63,11 +63,6 @@ if cc.has_link_argument('-Wl,--no-copy-dt-needed-entries')
 endif
 add_global_link_arguments(express_lflags, language: 'c')
 
-have_visibility_hidden = cc.has_argument('-fvisibility=hidden')
-if have_visibility_hidden
-  add_global_arguments('-fvisibility=hidden', language: 'c')
-endif
-
 pkgconfig = import('pkgconfig')
 windows = import('windows')