gdisk: close(2) needs unistd.h

Fixes http://autobuild.buildroot.net/results/c557ee7cd1247e024b5edccf5f824eb4d5212e25

Fixed upstream as well in the (big) 0.8.3 commit:
http://gptfdisk.git.sourceforge.net/git/gitweb.cgi?p=gptfdisk/gptfdisk;a=commit;h=3488294d718a0e8b7f312c80c9e5729671173f6a

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gdisk/gdisk-0.6.14-unistd.patch

@@ -0,0 +1,19 @@
+[PATCH] close(2) needs unistd.h
+
+Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
+---
+ diskio-unix.cc |    1 +
+ 1 file changed, 1 insertion(+)
+
+Index: gdisk-0.6.14/diskio-unix.cc
+===================================================================
+--- gdisk-0.6.14.orig/diskio-unix.cc
++++ gdisk-0.6.14/diskio-unix.cc
+@@ -22,6 +22,7 @@
+ #include <errno.h>
+ #include <fcntl.h>
+ #include <sys/stat.h>
++#include <unistd.h>
+ #include <iostream>
+ 
+ #include "diskio.h"