Ports: Update libicu's patches to use git patches

Ports/libicu/patches/0001-Set-host-to-serenity-in-configure.patch

@@ -0,0 +1,25 @@
+From 8ab9c30e87cc95f6ad201eaa396c0ea2c62f9a41 Mon Sep 17 00:00:00 2001
+From: Gunnar Beutner <gbeutner@serenityos.org>
+Date: Mon, 16 May 2022 18:03:31 +0430
+Subject: [PATCH 1/2] Set host to serenity in configure
+
+---
+ configure | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/configure b/configure
+index a2ff7e4..8283dc9 100755
+--- a/configure
++++ b/configure
+@@ -5274,6 +5274,8 @@ x86_64-*-cygwin)
+ 	else
+ 		icu_cv_host_frag=mh-cygwin-msvc
+ 	fi ;;
++*-serenity*)
++	icu_cv_host_frag=mh-serenity ;;
+ *-*-mingw*)
+ 	if test "$GCC" = yes; then
+                 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+-- 
+2.36.1
+