[bug-gnu-libiconv] Another iconv doc suggestion, for README.woe32

[amores perros]

I suggest adding the following line to the top of README.woe32
(or something similar -- obviously Bruno may be able to state
this more accurately):

WARNING: This file documents how to build iconv
with Microsoft Visual C++, but starting with version 1.12,
iconv is expected to be compiled with a real gcc toolkit
such as cygwin or mingw on MS-Windows platforms, and
support for Microsoft Visual C++ as a build development
has been dropped.

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