Log Message:
qt4-libs: Shorten DESCR and mention non-standard PREFIX.

Prune excessive marketing non-content from DESCR.  Note that this is
EOL and here because unmaintained useful software uses it.

This package installs to $PREFIX/qt4 to avoid collisions; DESCRibe
that.  Drop MESSAGE, which is tutorial about the alternate prefix (and
does not explain how to avoid persistent damage from not reading, and
thus fails to meet MESSAGE acceptability criteria).