pgsql: Add Charset WIN1252 support.

Log Message:
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Add Charset WIN1252 support.

Roland Volkmann

Modified Files:
--------------
pgsql/src/backend/utils/mb:
encnames.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/encnames.c.diff?r1=1.20&r2=1.21)
pgsql/src/include/mb:
pg_wchar.h (r1.52 -> r1.53)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/mb/pg_wchar.h.diff?r1=1.52&r2=1.53)

Added Files:
-----------
pgsql/src/backend/utils/mb/Unicode:
utf8_to_win1252.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_win1252.map?rev=1.1&content-type=text/x-cvsweb-markup)
win1252_to_utf8.map (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/win1252_to_utf8.map?rev=1.1&content-type=text/x-cvsweb-markup)
pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252:
Makefile (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252/Makefile?rev=1.1&content-type=text/x-cvsweb-markup)
utf8_and_win1252.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win1252/utf8_and_win1252.c?rev=1.1&content-type=text/x-cvsweb-markup)