More compilation fixes after r72978

[dghart]

Even after r72984, the r72978 wxNOEXCEPT changes break compilation using debian wheezy's gcc 4.7.1, as treectrl dtor definitions don't match their declarations. The patch fixes wxGTK and wxX11 builds, and there's a blind fix for any remaining wxGTK1 users.

[vadz]

I'm afraid we may need to rethink this, I didn't realize that r72978 would result in breaking compilation of all user-defined classes deriving from wxTextCtrl. Unless there is some way around this, I'm going to revert all this, the benefit of this change is not nearly high enough to justify this breakage.

[VZ]

(In [72989]) More compilation fixes after wxNOEXCEPT introduction.

This is a temporary change, r72984 and the following changes (see #14826) will
probably be reverted soon anyhow, but for now at least fix wxGTK compilation.

Closes #14837.

[ghostvoodooman]

no real changes: removed a Cc: me, I'm a subscriber of wx-dev and -commit list (noting this for future as well...).