libidn: install libidn.pc in staging area & refresh patches

libidn.pc file was missing in package staging area causing build
failures for other packages expecting to find libidn package config
files.

refreshed patches to clear existing patch fuzz

take over maintainership

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>

libs/libidn/patches/002-disable-po-docs-examples.patch

@@ -11,7 +11,7 @@
  EXTRA_DIST = cfg.mk maint.mk .clcopying
 --- a/configure.ac
 +++ b/configure.ac
-@@ -48,8 +48,6 @@ AC_PROG_LIBTOOL
+@@ -47,8 +47,6 @@ LT_INIT([win32-dll])
  # Checks for programs.
  AM_MISSING_PROG(PERL, perl, $missing_dir)
  AM_MISSING_PROG(HELP2MAN, help2man, $missing_dir)

libs/libidn/patches/010-fix-idn-error-usage.patch

@@ -1,6 +1,6 @@
 --- a/src/idn.c
 +++ b/src/idn.c
-@@ -169,7 +169,7 @@ main (int argc, char *argv[])
+@@ -170,7 +170,7 @@ main (int argc, char *argv[])
        (args_info.idna_to_unicode_given ? 1 : 0) +
        (args_info.nfkc_given ? 1 : 0) != 1)
      {
@@ -9,7 +9,7 @@
        usage (EXIT_FAILURE);
      }
  
-@@ -184,7 +184,7 @@ main (int argc, char *argv[])
+@@ -185,7 +185,7 @@ main (int argc, char *argv[])
    if (!args_info.quiet_given
        && args_info.inputs_num == 0
        && isatty (fileno (stdin)))
@@ -18,7 +18,7 @@
  		       "terminated by a newline character.\n"));
  
    do
-@@ -199,7 +199,7 @@ main (int argc, char *argv[])
+@@ -197,7 +197,7 @@ main (int argc, char *argv[])
  	  if (feof (stdin))
  	    break;
  
@@ -26,8 +26,8 @@
 +	  error (EXIT_FAILURE, errno, "%s", _("input error"));
  	}
  
-       if (readbuf[strlen (readbuf) - 1] == '\n')
-@@ -216,7 +216,7 @@ main (int argc, char *argv[])
+       if (strlen (line) > 0)
+@@ -215,7 +215,7 @@ main (int argc, char *argv[])
  	  if (!q)
  	    {
  	      free (p);
@@ -36,7 +36,7 @@
  		     _("could not convert from UTF-8 to UCS-4"));
  	    }
  
-@@ -241,7 +241,7 @@ main (int argc, char *argv[])
+@@ -240,7 +240,7 @@ main (int argc, char *argv[])
  	  if (!q)
  	    {
  	      free (r);