Turning off default variants

[Mike Alexander]

I installed swig with:

port install swig +guile+perl+python+ruby-php5

since I don't need php5 in swig and don't want to install apache2 just 
to get it.  However when I enter "port installed swig" I get

The following ports are currently installed:
  swig @1.3.39_0+guile+perl+python+ruby (active)

What happened to the "-php5"?  This is relevant since later when I 
upgrade swig it will get the +php5 variant again (since it is the 
default) and try to install apache2.

      Mike