Ports: Add ntbtls port

Ports/AvailablePorts.md

@@ -71,6 +71,7 @@ Please make sure to keep this list up to date when adding and updating ports. :^
 | [`nesalizer`](nesalizer/)      | Nesalizer                                     |                   | https://github.com/SerenityOS/nesalizer               |
 | [`ninja`](ninja/)              | Ninja                                         | 1.8.2             | https://ninja-build.org/                              |
 | [`npth`](npth/)                | New GNU Portable Threads Library              | 1.6               | https://gnupg.org/software/npth/index.html            |
+| [`ntbtls`](ntbtls/)            | The Not Too Bad TLS Library                   | 0.2.0             | https://gnupg.org/software/ntbtls/index.html          |
 | [`nyancat`](nyancat/)          | Nyancat                                       |                   | https://github.com/klange/nyancat                     |
 | [`openssh`](openssh/)          | OpenSSH                                       | 8.3-9ca7e9c       | https://github.com/openssh/openssh-portable           |
 | [`openssl`](openssl/)          | OpenSSL                                       | 1.0.2             | https://www.openssl.org/                              |

Ports/ntbtls/package.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port=ntbtls
+version=0.2.0
+useconfigure=true
+#configopts="--with-libgpg-error-prefix=${SERENITY_BUILD_DIR}/Root/usr/local"
+files="https://gnupg.org/ftp/gcrypt/ntbtls/ntbtls-${version}.tar.bz2 ntbtls-${version}.tar.bz2"
+
+pre_configure() {
+    export ntbtls_cv_gcc_has_f_visibility=no
+}
+
+configure() {
+    run ./configure --host="${SERENITY_ARCH}-pc-serenity" --build="$($workdir/build-aux/config.guess)" $configopts
+}

Ports/ntbtls/patches/configure.patch

@@ -0,0 +1,12 @@
+diff -Naur ntbtls-0.2.0/build-aux/config.sub ntbtls-0.2.0.serenity/build-aux/config.sub
+--- ntbtls-0.2.0/build-aux/config.sub	2016-07-13 19:10:49.000000000 +0200
++++ ntbtls-0.2.0.serenity/build-aux/config.sub	2021-04-14 02:52:34.178672014 +0200
+@@ -1381,7 +1381,7 @@
+ 	# The portable systems comes first.
+ 	# Each alternative MUST END IN A *, to match a version number.
+ 	# -sysv* is not here because it comes later, after sysvr4.
+-	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
++	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* | -serenity* \
+ 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
+ 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
+ 	      | -sym* | -kopensolaris* | -plan9* \