redoconf: assorted minor fixes.

- libqt4.rc: add detection of the 'moc' command in $MOC.
- libssl.rc: add detection script for openssl.
- default.do.sh: provide a die() function to all .od files.  It's just
  too useful to not have it (I haven't converted everything to it yet).
- When building out/x/y.z, match against $S/default.z.od and
  $S/default.od if they exist.
- *.list files (lists of source/object files to include in a binary)
  can now contain *.o files in addition to *.c, *.cc, etc.
- rename compile() to _compile() to avoid polluting the namespace for
  scripts called from default.do.sh.
- When building a .so file in the top level directory, no need to
  make a symlink of it into the top level directory.
- link.od and link-shlib.od forgot to make use of the $xLIBS variable.

redoconf/rc/libqt4.rc.od

@@ -5,6 +5,14 @@ prog='
 #include <QVector>
 '
 
-rc_pkg_detect LIBQT4 QtCore \
+rc_pkg_detect LIBQT4 QtGui \
 	rc_compile cxx link "$prog"
+
+for d in "$MOC" moc-qt4 moc; do
+	if type "$d" >/dev/null 2>&1; then
+		rc_replaceln MOC "$d"
+		break
+	fi
+done
+
 rc_save