Remove (Open)Watcom support.

This compiler is not being developed since several years and almost certainly
can't be used to build the current wxWidgets sources anyhow, so remove all
support for it, including a lot of extremely ugly workarounds for its bugs
with template functions.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76546 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filename.cpp

@@ -120,12 +120,6 @@
 #include <unistd.h>
 #endif
 
-#ifdef __WATCOMC__
-#include <io.h>
-#include <sys/utime.h>
-#include <sys/stat.h>
-#endif
-
 #ifndef S_ISREG
     #define S_ISREG(mode) ((mode) & S_IFREG)
 #endif
@@ -313,7 +307,7 @@ static bool IsUNCPath(const wxString& path, wxPathFormat format)
 // the appropriate file with an extra twist that it also works when there is no
 // wxFileName object at all, as is the case in static methods.
 
-#if defined(__UNIX_LIKE__) || defined(__WXMAC__) || (defined(__DOS__) && defined(__WATCOMC__))
+#if defined(__UNIX_LIKE__) || defined(__WXMAC__)
     #define wxHAVE_LSTAT
 #endif
 
@@ -2621,7 +2615,7 @@ bool wxFileName::SetTimes(const wxDateTime *dtAccess,
             return true;
         }
     }
-#elif defined(__UNIX_LIKE__) || (defined(__DOS__) && defined(__WATCOMC__))
+#elif defined(__UNIX_LIKE__)
     wxUnusedVar(dtCreate);
 
     if ( !dtAccess && !dtMod )