lang/icon: Add DragonFly support

Bring in fix from dports (port is not maintained)

lang/icon/files/patch-ipl_cfuncs_fpoll.c

@@ -0,0 +1,14 @@
+--- ipl/cfuncs/fpoll.c.orig	2009-10-27 20:39:16 UTC
++++ ipl/cfuncs/fpoll.c
+@@ -37,7 +37,11 @@
+ 
+ int fpoll(int argc, descriptor *argv)	/*: await data from file */
+    {
++#ifdef __DragonFly__
++   struct __FILE_public *f;
++#else
+    FILE *f;
++#endif
+    int msec, r;
+    fd_set fds;
+    struct timeval tv, *tvp;

lang/icon/files/patch-ipl_cfuncs_mklib.sh

@@ -0,0 +1,11 @@
+--- ipl/cfuncs/mklib.sh.orig	2015-03-22 15:13:09 UTC
++++ ipl/cfuncs/mklib.sh
+@@ -11,7 +11,7 @@ shift
+ SYS=`uname -s`
+ set -x
+ case "$SYS" in
+-   Linux*|*BSD*|GNU*)
++   DragonFly*|Linux*|*BSD*|GNU*)
+       $CC -shared -o $LIBNAME -fPIC "$@";;
+    CYGWIN*)
+       # move the win32 import library for iconx.exe callbacks