lib/unicore/mktables: remove unused variable

Variable '$full_filename' is declared and assigned to, but not used
anywhere else in the program.  The string '$full_filename' is found
nowhere else in the core distribution.  Hence, the variable is
superfluous.

After making that change, had to run porting programs:

  $ ./perl -Ilib regen/regcharclass.pl
  Changed: regcharclass.h
  $ ./perl -Ilib regen/mk_invlists.pl
  Changed: regexp_constants.h charclass_invlists.inc
           lib/unicore/uni_keywords.pl uni_keywords.h

Author: jkeenan

charclass_invlists.inc

@@ -456712,7 +456712,7 @@ static const U8 WB_dfa_table[] = {
  * 4be1c18e7b121d951018065b453bb05083f624c8f905ce8be7c0f354c9097c95 lib/unicore/extracted/DLineBreak.txt
  * 786833e0a3f5ec0c0cd0940e4c15f730f3a92163f354ecd7dede28a70c0fa892 lib/unicore/extracted/DNumType.txt
  * 00b43cc5c9b86a834f82389c4537f103e652821387daa556f0bd220f6c23007e lib/unicore/extracted/DNumValues.txt
- * 308c29a8d4df1761b0ea5a6a93fbe8649a80b7863d2848be6dc2d65238348e13 lib/unicore/mktables
+ * 5c5d8c9c8d991938d1c22d94779d493b65451e83c9b1274b8e43fd7f192493be lib/unicore/mktables
  * 63f771c327e92574fbd77919586079c38f669058a5e6b67ccec385ef8fcde882 lib/unicore/version
  * 0a6b5ab33bb1026531f816efe81aea1a8ffcd34a27cbea37dd6a70a63d73c844 regen/charset_translations.pl
  * c7ff8e0d207d3538c7feb4a1a152b159e5e902d20293b303569ea8323e84633e regen/mk_PL_charclass.pl

lib/unicore/mktables

@@ -16070,9 +16070,6 @@ sub register_file_for_name($table, $directory_ref, $file) {
         $directory_ref =\@directories;
     }
 
-    # Join all the file path components together, using slashes.
-    my $full_filename = join('/', @$directory_ref, $file);
-
     # All go in the same subdirectory of unicore, or the special
     # pseudo-directory '#'
     if ($directory_ref->[0] !~ / ^ $matches_directory | \# $ /x) {

lib/unicore/uni_keywords.pl

@@ -79,7 +79,7 @@
  * 4be1c18e7b121d951018065b453bb05083f624c8f905ce8be7c0f354c9097c95 lib/unicore/extracted/DLineBreak.txt
  * 786833e0a3f5ec0c0cd0940e4c15f730f3a92163f354ecd7dede28a70c0fa892 lib/unicore/extracted/DNumType.txt
  * 00b43cc5c9b86a834f82389c4537f103e652821387daa556f0bd220f6c23007e lib/unicore/extracted/DNumValues.txt
- * 308c29a8d4df1761b0ea5a6a93fbe8649a80b7863d2848be6dc2d65238348e13 lib/unicore/mktables
+ * 5c5d8c9c8d991938d1c22d94779d493b65451e83c9b1274b8e43fd7f192493be lib/unicore/mktables
  * 63f771c327e92574fbd77919586079c38f669058a5e6b67ccec385ef8fcde882 lib/unicore/version
  * 0a6b5ab33bb1026531f816efe81aea1a8ffcd34a27cbea37dd6a70a63d73c844 regen/charset_translations.pl
  * c7ff8e0d207d3538c7feb4a1a152b159e5e902d20293b303569ea8323e84633e regen/mk_PL_charclass.pl