* Added new unit unixcp. It contains stuff from winiconv.inc - a table to map Windows code page identifiers to locale names on unix. Also GetSystemCodePage function in this unit can be used to detect which code page is used currently. 
* Build unixcp for all unix-like systems.
* Use the unixcp unit in cwstring instead of winiconv.inc.
- Deleted winiconv.inc
- Reverted r22410,r22411,r22428. The compiler will use the unixcp unit to get a default code page for ansistrings.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23670 3ad0048d-3df7-0310-abae-a5850022a9f2
* Use the unixcp unit to set a default code page for ansistrings on unix-like systems.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23671 3ad0048d-3df7-0310-abae-a5850022a9f2