Applied patch [ 608370 ] fix for static text sizing behaviour

Applied patch [ 608370 ] fix for static text sizing behaviour

wxStaticText is meant to resize when SetLabel is called
unless the flag wxST_NO_AUTORESIZE is used when
creating it. Motif currently ignores this flag and always
resizes the control.
The attached patch provides a wxStaticText specific
override of SetLabel() which honours the resize policy
requested via the wxST_NO_AUTORESIZE flag.

I have tested on AIX 4.3 which is Motif 2.1

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@17161 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775