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.

docs/cookbook/c/configure.help

@@ -10,7 +10,7 @@ LIBS         Extra libraries to always link against (eg. -lsocket)
 STATIC       Link libraries and binaries statically
 CXX          C++ compiler name (c++)
 CXXFLAGS     Extra C++ compiler flags (eg. -O2 -g)
-LIBQT4       Extra linker options for 'QtCore'
+LIBQT4       Extra linker options for 'QtGui'
 LIBGTK2      Extra linker options for 'gtk+-2.0 gio-2.0 gdk-2.0 gdk-pixbuf-2.0'
 LIBM         Extra linker options for 'libm'
 LIBPNG       Extra linker options for 'libpng'