Updated runtime files.
updated for version 7.3.919
Problem:    An empty nl.po file does not work with an old msgfmt.
Solution:   Put a single # in the file. (Laurent Blume)
Added tag v7-3-919 for changeset 12636b824816
updated for version 7.3.920
Problem:    Compiler warning for size_t to int.
Solution:   Add a type cast. (Mike Williams)
Added tag v7-3-920 for changeset 923277a9cce4
updated for version 7.3.921
Problem:    Trying to create a fontset handle when 'guifontset' is not set.
Solution:   Add curly braces around the code block. (Max Kirillov)
Added tag v7-3-921 for changeset 97474f967eec
updated for version 7.3.922
Problem:    No test for what 7.3.918 fixes.
Solution:   Add a test. (David Bürgin)
Added tag v7-3-922 for changeset 1d56e5dfa08e
updated for version 7.3.923
Problem:    Check for X11 header files fails on Solaris.
Solution:   Only use -Werror for gcc. (Laurent Blume)
Added tag v7-3-923 for changeset 6ecb80dc6521