Ports: Add a citron port

This disables the GC, so the REPL doesn't run, but basic programs do
work.

Ports/citron/patches/ReadMe.md

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+# Patches for citron on SerenityOS
+
+## `0001-Remove-m-tune-arch-native.patch`
+
+Remove -m(tune arch)=native
+
+
+## `0002-Don-t-use-execinfo-on-serenity.patch`
+
+Don't use execinfo on serenity
+
+
+## `0003-Get-rid-of-wordexp-on-serenity.patch`
+
+Get rid of wordexp on serenity
+
+
+## `0004-Use-fcntl.h-on-serenity.patch`
+
+Use <fcntl.h> on serenity
+
+
+## `0005-Pull-arc4random-from-stdlib.h.patch`
+
+Pull arc4random from stdlib.h
+
+
+## `0006-Don-t-use-prctl.patch`
+
+Don't use prctl
+
+
+## `0007-Make-fiber-a-noop.patch`
+
+Make fiber a noop
+
+Serenity doesn't have ucontext.
+
+## `0008-Make-coroutines-a-noop.patch`
+
+Make coroutines a noop
+
+Serenity doesn't have ucontext.
+
+## `0009-Use-setjmp-for-callcc.patch`
+
+Use setjmp for callcc
+
+
+## `0010-Don-t-mess-with-libsocket.patch`
+
+Don't mess with libsocket
+
+
+## `0011-Disable-inject.patch`
+
+Disable inject
+
+tcc requires ucontext.
+
+## `0012-Use-unsigned-short-int-instead-of-u-short-int.patch`
+
+Use unsigned (short int) instead of u(short int)
+
+
+## `0013-Disable-openmp.patch`
+
+Disable openmp
+
+
+## `0014-Yoink-out-libs.patch`
+
+Yoink out libs
+
+
+## `0015-Make-boehm-gc-optional.patch`
+
+Make boehm gc optional
+
+
+## `0016-don-t-build-tcc-for-no-reason.patch`
+
+don't build tcc for no reason
+
+
+## `0017-Respect-DESTDIR.patch`
+
+Respect DESTDIR
+
+
+## `0018-Disable-GC-on-serenity.patch`
+
+Disable GC on serenity
+
+