[mythtv] QT3/QT4 Confusion in MythPlugins Configure Script

[Michael Hughes]

Some systems may have both QT3 and QT4 installed. In this case "qmake" 
may invoke QT3 and it may be necessary to use "qmake-qt4" explicitly to 
get the later system. Invoke "qmake --version" to see what you have. For 
reasons I have not investigated, "configure" for "mythtv" does not seem 
to have a problem with this but the one for "mythplugins" does.  It is 
necessary to use the "--qmake=qmake-qt4" argument with "configure" and 
then invoke "qmake-qt4 mythplugins.pro" before running "make".  This 
applies to both mythplugins 0.24.2 and 0.25-beta.

Mike