Ports: Add cfunge

This adds the `cfunge` Befunge interpreter. An interpreter for the
esoteric programming language Befunge written in C.

Ports/cfunge/patches/ReadMe.md

@@ -0,0 +1,19 @@
+# Patches for cfunge on SerenityOS
+
+## `arc4random_buf.patch`
+Somewhere on the way of configuring the variable `HAVE_arc4random_buf` was set which lead to the linker complaining about not knowing a certain `arc4random_stir()` function.
+This patch just negates the define and the linker is happy.
+
+
+## `define-max.patch`
+It is expected that `sys/param.h` defines a `MAX` macro. We don't. So here the needed macro is just inserted instead of the include.
+
+
+## `posix-mapped-files.patch`
+It is expected that `_POSIX_MAPPED_FILES` is defined as at least `1`, so we do that here.
+
+
+## `posix-regexp.patch`
+Same as before, just for `_POSIX_REGEXP`
+
+

Ports/cfunge/patches/arc4random_buf.patch

@@ -0,0 +1,10 @@
+--- ../src/prng.c
++++ ../src/prng.c
+@@ -29,6 +29,7 @@
+ #  undef HAVE_arc4random_buf
+ #endif
+ 
++#undef HAVE_arc4random_buf
+ #ifdef HAVE_arc4random_buf
+ #  define HAVE_ARC4RANDOM
+ #  ifndef ARC4RANDOM_IN_BSD

Ports/cfunge/patches/define-max.patch

@@ -0,0 +1,11 @@
+--- ../lib/fungestring/funge_str-two-way.h
++++ ../lib/fungestring/funge_str-two-way.h
+@@ -53,7 +53,7 @@
+ 
+ #include <limits.h>
+ #include <stdint.h>
+-#include <sys/param.h>                  /* Defines MAX.  */
++#define MAX(a,b) (((a)>(b))?(a):(b))
+ 
+ /* We use the Two-Way string matching algorithm, which guarantees
+    linear complexity with constant space.  Additionally, for long

Ports/cfunge/patches/posix-mapped-files.patch

@@ -0,0 +1,10 @@
+--- ../src/funge-space/funge-space.c
++++ ../src/funge-space/funge-space.c
+@@ -47,6 +47,7 @@
+ #include <sys/stat.h>  /* fstat, open */
+ #include <fcntl.h>     /* open, posix_fallocate */
+ 
++#define _POSIX_MAPPED_FILES 1
+ #if !defined(_POSIX_MAPPED_FILES) || (_POSIX_MAPPED_FILES < 1)
+ #  error "cfunge needs a working mmap(), which this system claims it lacks."
+ #endif

Ports/cfunge/patches/posix-regexp.patch

@@ -0,0 +1,10 @@
+--- ../src/fingerprints/REXP/REXP.c
++++ ../src/fingerprints/REXP/REXP.c
+@@ -28,6 +28,7 @@
+ #include <unistd.h>
+ #include <string.h>
+ 
++#define _POSIX_REGEXP 1
+ #if !defined(_POSIX_REGEXP) || (_POSIX_REGEXP < 1)
+ #  error "cfunge needs POSIX regular expressions, which this system claims it doesn't have."
+ #endif