weechat: switch back to cmake, support aspell

The weechat devs have informed us that configure is deprecated.
Switch back to cmake.
Add a user option to enable the aspell module.
Add a user option to enable the lua module.
Add an inreplace to fix the bad path in HB framework Python's
LINKFORSHARED variable and an explanation for it.
Add deps for lua and apsell if the user options those.
Add a caveat suggesting the user install aspell manually before
installing weechat, otherwise they won't have any dictionaries.
Remove the code that deleted the extra module symlinks.

The Aspell dep could be made into a requirement, but it would be
nice if Aspell installed at least the en dictionary by default.
All bindings work except the Ruby bindings when built against
rbenv and ruby-1.9.  This has been reported upstream and is the
main reason for switching back to cmake, so we can get support.
Tested on Lion using clang and llvm from XCode-4.3.3 against
system Python, HB framework and non-framework python, the current
Aspell, Lua, and Guile, system Ruby, and system Perl.

Fixes #12377

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

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