meson/mesa/wide: define WIN32_LEAN_AND_MEAN with pre_args

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18425>

meson.build

@@ -1617,6 +1617,10 @@ elif host_machine.system() != 'windows'
 else
   dep_expat = null_dep
 endif
+# Predefined macros for windows
+if host_machine.system() == 'windows'
+  pre_args += '-DWIN32_LEAN_AND_MEAN' # http://msdn2.microsoft.com/en-us/library/6dwk3a1z.aspx
+endif
 # this only exists on linux so either this is linux and it will be found, or
 # it's not linux and wont
 dep_m = cc.find_library('m', required : false)