Do define __VISUALC__ when using Intel compiler under Windows.

This undoes r74888, r74913 and r74969 because all of them were still not
enough to make ICC build work correctly. So instead of trying to find all the
places where we need to test for __INTELC__ in addition to __VISUALC__, just
revert to defining __VISUALC__ for ICC under Windows as it uses its CRT anyhow
and in the vast majority of cases we are actually testing for the CRT and not
the compiler anyhow.

Closes #15359.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74999 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filefn.cpp

@@ -1191,7 +1191,6 @@ wxRenameFile(const wxString& file1, const wxString& file2, bool overwrite)
 bool wxRemoveFile(const wxString& file)
 {
 #if defined(__VISUALC__) \
- || (defined(__WINDOWS__) && defined(__INTELC__)) \
  || defined(__BORLANDC__) \
  || defined(__WATCOMC__) \
  || defined(__DMC__) \