package/poppler: include ctype.h to fix build error

Fixes
http://autobuild.buildroot.net/results/a6a/a6a336f8b6a0136b204a34091e33dc4598178125/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/poppler/0001-Form.cc-include-ctype.h-to-fix-build-error.patch

@@ -0,0 +1,37 @@
+From f40143f7acca81b7d39d774ed4c349aec8d9310b Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd.kuhls@t-online.de>
+Date: Sat, 23 Sep 2017 11:37:23 +0200
+Subject: [PATCH] Form.cc: include ctype.h to fix build error
+
+Fixes
+Form.cc:546:28: error: 'isdigit' was not declared in this scope
+Form.cc:548:34: error: 'isxdigit' was not declared in this scope
+Form.cc:575:40: error: 'isxdigit' was not declared in this scope
+
+detected by buildroot autobuilders:
+http://autobuild.buildroot.net/results/a6a/a6a336f8b6a0136b204a34091e33dc4598178125/
+when cross-compiling with
+gcc version 4.7.3 (crosstool-NG hg+-c65fcf8a34b7)
+
+Patch sent upstream: https://bugs.freedesktop.org/show_bug.cgi?id=102951
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+---
+ poppler/Form.cc | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/poppler/Form.cc b/poppler/Form.cc
+index 83bceb20..e7efae95 100644
+--- a/poppler/Form.cc
++++ b/poppler/Form.cc
+@@ -32,6 +32,7 @@
+ #include <stddef.h>
+ #include <stdlib.h>
+ #include <string.h>
++#include <ctype.h>
+ #include "goo/gmem.h"
+ #include "goo/GooString.h"
+ #include "Error.h"
+-- 
+2.11.0
+