Don't mix statements and declarations, this is not allowed in C89.
Fixes compilation with MSVC <= 10 after 74da7cba07
See #17083.
(this is a backport of 9b029ea88a from master)
This is a modified version of the patch from Mozilla (see
https://hg.mozilla.org/releases/mozilla-esr31/rev/2f3e78643f5c) which was also
applied to Chromium. This version prefers to use the buffer of the correct
size instead of just returning an out-of-memory error if the size needed is
relatively (but not extraordinarily so, e.g. just slightly more than 64KB in
32 bit builds) big.
Merge with the latest version, mostly discarding our changes to 1.95.6 as they
seem to be unnecessary any longer, keep just bakefile-specific addition to
configure.
Also update our own makefile to define HAVE_EXPAT_CONFIG_H which is now needed
by Unix build.
Closes#11677.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74436 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
