dbghelp: While loading MSC debug info, don't handle public symbol at once, but delay their handling after all other symbols are loaded.

This allows to handle properly addresses between public and real
symbols. It should also increase drastically the performance of
.dbg/.pdb loading.

Plug a potential memory leak as well.

string_binding is of type "const WCHAR *" so we shouldn't be calling
strlen on it, we should be calling strlenW on it.

These are now constructed automatically from the major, minor, build
and platform ID numbers defined in version.h.

wine_common_ver.rc: Allow the file version number and string to be automatically constructed from major, minor, build and platform ID numbers.