r7168: Updating file times from libsmbclient was not working for win98. Although

r7168: Updating file times from libsmbclient was not working for win98.  Although
the function that was being used to set attributes is a core protocol
function (SMBsetatr = 0x09), it does not appear to work on win98.  As a
temporary measure, when file times are to be set, this version opens the
file and uses SMBsetattrE = 0x22 instead.  (The other advantage of this
function over the original one is that it supports setting access time as
well as modification time.)

The next step, the proper solution if it can be made to work, is to write
functions that use TRANS2_SET_PATH_INFO instead.