Log Message:
byacc: update to 20210808.

2021-08-08  Thomas E. Dickey  <dickey@invisible-island.net>

	* reader.c:
	fix memory-leak when replacing $$'s in destructor code (report/testcase
	by Boris Kolpackov).

	* main.c: account for a memory-leak

	* btyaccpar.skel, yaccpar.skel:
	revert change to initialization of yystate, which confuses gcc, making a
	different warning