up to 7.3.923

7.3.919  (after 7.3.788) empty nl.po file does not work with old msgfmt
7.3.920  compiler warning for size_t to int
7.3.921  trying to create a fontset handle when 'guifontset' is not set
7.3.922  no test for what 7.3.918 fixes
7.3.923  configure check for X11 header files fails on Solaris