this should fix the p3dcert compile error

makepanda/makepanda.py

@@ -3880,11 +3880,13 @@ if (RTDIST or RUNTIME):
     if (PkgSkip("FLTK")==0):
       OPTS.append("FLTK")
       TargetAdd('plugin_p3dCert.obj', opts=OPTS, input='p3dCert.cxx')
+      TargetAdd('p3dcert.exe', input='plugin_mkdir_complete.obj')
       TargetAdd('p3dcert.exe', input='plugin_p3dCert.obj')
       OPTS=['NOSTRIP', 'OPENSSL', 'FLTK', 'WINCOMCTL', 'WINSOCK']
     else:
       OPTS.append("WX")
       TargetAdd('plugin_p3dCert.obj', opts=OPTS, input='p3dCert_wx.cxx')
+      TargetAdd('p3dcert.exe', input='plugin_mkdir_complete.obj')
       TargetAdd('p3dcert.exe', input='plugin_p3dCert.obj')
       OPTS=['NOSTRIP', 'OPENSSL', 'WX', 'CARBON', 'WINOLE', 'WINOLEAUT', 'WINUSER', 'ADVAPI', 'WINSHELL', 'WINCOMCTL', 'WINGDI', 'WINCOMDLG']