Name the variables that have the names of ".lo" files as _LO, not _O;

Name the variables that have the names of ".lo" files as _LO, not _O;
put the name of the ".o" files into _O variables (I'm not sure whether
the current .am files automatically support building programs statically
linked with libethereal, as a result of using libtool; if so, the _O
versions of those variables aren't necessary, and, if not, we probably
need to use them).

Use the _LO variables in libethereal_la_LIBADD and
libethereal_la_DEPENDENCIES.

(This means that we use "g_ascii_strtoull.lo" rather than
"g_ascii_strtoull.o" to make the libethereal shared library; that's what
we need to do, but we weren't doing it.)

svn path=/trunk/; revision=11906