Log Message:
{standalone-,static-,}tcsh: Update to 6.21.00

pkgsrc changes:
 - Add patch-nls_Makefile.in to avoid +x bit in *.cat files
 - Remove no longer needed patches (all applied upstream):
   patch-ed.chared.c, patch-ed.inputl.c, patch-nls-catgen, patch-sh.func.c,
   patch-tw.init.c

Changes:
V6.21.00 - 20190508
-------------------
 - Abort history loading on words and lines too long
     https://bugzilla.redhat.com/show_bug.cgi?id=1598502
 - PR/37: Introduce GetCmdChar() to avoid open coding array access.
   make closem() not close sockets so as not to affect nss_ldap.
     tcsh never creates sockets so that's ok (Miloslav Trmac)
 - PR/597: Make rmstar work with aliased rm
 - convert match() from recursive to backtracking.
 - Handle 8 bit characters in bindkey (Werner Fink)
 - Look for tgetent in libtinfo as well (Werner Fink)
 - Don't play pointer tricks that are undefined in modern c (Brooks Davis)
 - Fix out of bounds read (Brooks Davis)
 - Fix type of read in prompt confirmation (eg. rmstar) (David Kaspar)
 - PR/471: Delay arginp parsing

ok <kim>, thanks!