Ports: Update and fix imgcat

- Update imgcat to 2.5.1 to get rid of prebuilt object files that have
  accidentally been included in the previous release tarball.
- Add a missing dependency on `termcap`.
- Remove an unused include of `err.h`, which we do not support.
- Use actually working settings for installing the built files.

Ports/imgcat/patches/0001-Remove-an-include-of-err.h.patch

@@ -0,0 +1,26 @@
+From 6163cab16b54ccc7301a083f9f3f7c7b6d435713 Mon Sep 17 00:00:00 2001
+From: Tim Schumacher <timschumi@gmx.de>
+Date: Sun, 8 May 2022 22:53:34 +0200
+Subject: [PATCH] Remove an include of `err.h`
+
+`err.h` appears to be BSD-specific, and we don't support it. Luckily,
+imgcat compiles just fine even when removing it.
+---
+ src/imgcat.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/src/imgcat.c b/src/imgcat.c
+index 26a73d7..89fc05d 100644
+--- a/src/imgcat.c
++++ b/src/imgcat.c
+@@ -22,7 +22,6 @@
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+-#include <err.h>
+ #include <limits.h>
+ 
+ #include <getopt.h>
+-- 
+2.36.1
+

Ports/imgcat/patches/ReadMe.md

@@ -0,0 +1,9 @@
+# Patches for imgcat on SerenityOS
+
+## `0001-Remove-an-include-of-err.h.patch`
+
+Remove an include of `err.h`
+
+`err.h` appears to be BSD-specific, and we don't support it. Luckily,
+imgcat compiles just fine even when removing it.
+