Daily bump.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@27793 138bc75d-0d04-0410-961f-82ee72b054a4

gcc/version.c

-char *version_string = "gcc-2.96 19990627 (experimental)";
+char *version_string = "gcc-2.96 19990628 (experimental)";