Added decoder for HTML-encoded and URL-encoded passwords and usernames.

This prevents special characters from not being recognized. Reported by P.H.Vos.
Also updated gnulib and added c-strncasecmp

gl/m4/gnulib-comp.m4

@@ -39,6 +39,7 @@ AC_DEFUN([gl_EARLY],
   m4_pattern_allow([^gl_LTLIBOBJS$])dnl a variable
   AC_REQUIRE([gl_PROG_AR_RANLIB])
   # Code from module c-ctype:
+  # Code from module c-strcase:
   # Code from module cloexec:
   # Code from module close:
   # Code from module dup2:
@@ -370,6 +371,9 @@ AC_DEFUN([gl_FILE_LIST], [
   build-aux/snippet/warn-on-use.h
   lib/c-ctype.c
   lib/c-ctype.h
+  lib/c-strcase.h
+  lib/c-strcasecmp.c
+  lib/c-strncasecmp.c
   lib/cloexec.c
   lib/cloexec.h
   lib/close.c