Log Message:
Update to 4.7l, set LICENSE.

2014/01/01 (4.7l)
- add "docs" rule to makefile.
- correct configure check for yyname vs yytname, broken by 4.7i changes
- update config.guess

2013/10/25 (4.7k)
- modify configure script, etc., to support cross-compiles, e.g., to MinGW.
- updated configure macros
  - support --datarootdir option
  - various portability fixes for CF_XOPEN_SOURCE
  - add checks for clang
  - improve macros for checking for standard C compiler
  - modified macros to support third parameter of AC_DEFINE used by autoheader
- update config.guess, config.sub

2011/01/02 (4.7j)
- amend a check for function name to allow cases such as this:
  int (foo)();
  which is distinct from a function-pointer, e.g.,
  int (*foo)();
- modified configure script to deprecate ${name-value} in favor of standard
  ${name:-value}.
- update config.guess, config.sub