build: osx: set chmod to 755 for non-bundle binary during install

When installing the bundle we also manually install the origianl binary. Waf
defaults to chmod 644, so we must explicitely set it to 755.

wscript_build.py

@@ -434,7 +434,8 @@ def build(ctx):
     )
 
     if ctx.dependency_satisfied('macosx-bundle'):
-        ctx.install_files(ctx.env.BINDIR, 'mpv')
+        from waflib import Utils
+        ctx.install_files(ctx.env.BINDIR, 'mpv', chmod=Utils.O755)
 
     if ctx.dependency_satisfied("vf-dlopen-filters"):
         dlfilters = "showqscale telecine tile rectangle framestep \