Multiple fixes for broken Linux SHARED=1 build.

Multiple fixes for broken Linux SHARED=1 build. This gets things building, but the resulting 'chrome' binary crashes on start-up (test_shell seems to work better).

[Michael Moss, 2009-02-23 18:59:19]

Should we have a "SHARED=1" builder to make sure this doesn't get so badly out
of sync going forward, or is the shared build just not that important? Aren't
people were using this to help speed up linking?

[Evan Martin, 2009-02-23 19:41:46]

The crash is likely in spell checker code, which I fixed here:
http://codereview.chromium.org/27036/show
That also builds shared for me.  Maybe I'm pulling in some old .as though.

I guess Lei is a good reviewer for it... (?)

[Michael Moss, 2009-02-23 19:50:28]

> That also builds shared for me.  Maybe I'm pulling in some old .as though.

Yeah, I didn't start having problems until I did a fully clean build one day
last week, so I think people who haven't done that lately might not see the
breakage.

[Lei Zhang, 2009-02-23 22:13:18]

The changes to build/SConscript.main, chrome/test/unit/unit_tests.scons,
chrome/third_party/hunspell/SConscript, and
chrome/tools/convert_dict/convert_dict.scons is all I needed to fix the build
here, at r10215.

[Michael Moss, 2009-02-23 22:49:34]

This works for you with a clean build and checkout? I still get errors if I only
include those changes.

[Lei Zhang, 2009-02-23 23:55:16]

LGTM

The changes make sense. It seems we had some build differences between dbg and
opt?