Out-of-the-tree build fixes

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Hello people,

I hav been working this evening in the Glib module, and I noticed that 
out-of-the-tree builds (i.e: configuring & building from a directory 
not into the source tree) didn't work, so I fixed "configure.ac" and 
some "Makefile.am"s (under src/modules).

Now you can build without touching the source tree:

    $ cvs -z3 co luacheia
    $ mkdir lc-build
    $ cd lc-build
    $ ../luacheia/configure
    $ make

The problem were directories being referenced with relative paths, 
example line from "src/modules/lxp/Makefile.am":

    INCLUDES = -I@LUA_SRCDIR@ -Iexpat

...that must be changed to:

    INCLUDES = -I@LUA_SRCDIR@ -I$(top_srcdir)/src/modules/lxp/expat

...and so on. From within "configure.ac" you can use the "${srcdir}" 
shell variable, it contains exactly the same path as "$(top_srcdir)" in 
Makefiles. If someone changes the build system (e.g: because of a 
module being added to LuaCheia) _please_ take care with that.

Note that with some automake variables (like luafoo_la_SOURCES, 
luafoo_la_LIBADD, etc) you can use relative paths as usual. It seems 
that automake effectively takes care about that, but for some reason it 
doesn't do the same with other variables. Strange, ehm?

-ap

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