Ports: Switch to new ports system (#594)

Much redundancy is removed from package scripts with this system.
It also supports simple dependency management, uninstalling (through
BSD ports style plist files), cleaning up after itself (with clean,
clean_dist, clean_all commands), etc.

Ports/bash/patches/include-stdio.patch

@@ -0,0 +1,13 @@
+diff --git a/include/stdc.h b/include/stdc.h
+index c66492f0..5991f4bd 100644
+--- a/include/stdc.h
++++ b/include/stdc.h
+@@ -22,6 +22,8 @@
+ #if !defined (_STDC_H_)
+ #define _STDC_H_
+ 
++#include <stdio.h>
++
+ /* Adapted from BSD /usr/include/sys/cdefs.h. */
+ 
+ /* A function can be defined using prototypes and compile on both ANSI C