MDEV-15091 : Windows, 64bit: reenable and fix warning C4267 (conversion from 'size_t' to 'type', possible loss of data)

Handle string length as size_t, consistently (almost always:))
Change function prototypes to accept size_t, where in the past
ulong or uint were used. change local/member variables to size_t
when appropriate.

This fix excludes rocksdb, spider,spider, sphinx and connect for now.

plugin/auth_gssapi/sspi_errmsg.cc

@@ -138,7 +138,7 @@ void sspi_errmsg(int err, char *buf, size_t size)
   len = FormatMessageA(
     FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
     err, MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
-    buf, size, NULL);
+    buf, (DWORD)size, NULL);
 
   if(len > 0)
   {