initialize docstrings for built-in functions from file * libinterp/Makefile.am: Install DOCSTRINGS file in $(octetcdir)/built-in-docstrings. * defaults.cc (set_built_in_docstrings_file): New function. (install_defaults): Call it. (Vbuilt_in_docstrings_file): New variable. * defaults.in.h (Vbuilt_in_docstrings_file): Provide decl. * help.cc (Fbuilt_in_docstrings_file, install_built_in_docstrings): New functions. * help.h (install_built_in_docstrings): Provide decl. * mkbuiltins: Generate call to install_built_in_docstrings at end of install_builtins function. * octave.cc: Handle new option --built-in-docstrings-file. (octave_process_command_line): Handle BUILT_IN_DOCSTRINGS_FILE_OPTION. * run-octave.in: Pass --built-in-docstrings-file option to Octave.

--- a/libinterp/interpfcn/defaults.in.h
+++ b/libinterp/interpfcn/defaults.in.h
@@ -207,6 +207,8 @@
 extern OCTINTERP_API std::string Vlocal_site_defaults_file;
 extern OCTINTERP_API std::string Vsite_defaults_file;
 
+extern OCTINTERP_API std::string Vbuilt_in_docstrings_file;
+
 // Name of the FFTW wisdom program.
 extern OCTINTERP_API std::string Vfftw_wisdom_program;