README: add Open Watcom as a tested compiler

Tested sfeed, sfeed_plain and sfeed_html for now.

There are minor changes required for sfeed and some additional compatibility
function changes required to make the format tools compile.

Rough list of changes required:
- xml.c: rename getchar_unlocked -> getchar
- sfeed.c: EOVERFLOW -> ENOMEM
- wcwidth: just filter ASCII range < 32 = -1 and > 127 = 0, rest = 1.
- getline
- localtime_r -> just do a localtime + memcpy.

Make sure to increase stack size when compiling:

	owcc -k32768 -Os -s -o sfeed.exe sfeed.c util.c xml.c

Resulting .exe binary is 27KB, 17KB compressed with UPX.

The HTML output looks fine in Netscape Navigator and Internet Explorer 3 :)

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