* lib/regexprops.c (newpara): Function parameter list should be
declared as void in the function definition, instead of leaving it
blank (C++ style). This fixes a GCC warning controlled by
-Wstrict-prototypes.
(beginenum): Likewise.
(endenum): Likewise.
(endtable): Likewise.
(copying): Update copyright years.
* doc/regexprops.texi: Update copyright years to match the output
of regexprops.c.