build: allow to disable building the cplayer

wscript

@@ -728,6 +728,10 @@ scripting_features = [
 
 standalone_features = [
     {
+        'name': '--cplayer',
+        'desc': 'mpv CLI player',
+        'func': check_true
+    }, {
         'name': 'win32-executable',
         'desc': 'w32 executable',
         'deps_any': [ 'os-win32', 'os-cygwin'],

wscript_build.py

@@ -434,6 +434,8 @@ def build(ctx):
             install_name = '/mpv.app/Contents/Resources/' + res_basename
             ctx.install_as(ctx.env.BINDIR + install_name, resource)
 
+
+    if ctx.dependency_satisfied('cplayer'):
         ctx(
             target       = "mpv",
             source       = ctx.filtered_sources(sources) + ["player/main_fn.c"],