[many ports] Add GnuTLS and its dependencies

ports/libgnutls/CONTROL

@@ -0,0 +1,6 @@
+Source: libgnutls
+Version: 3.6.15
+Homepage: https://www.gnutls.org/
+Description: A secure communications library implementing the SSL, TLS and DTLS protocols
+Build-Depends: nettle, gmp, libtasn1, libidn2
+Supports: !windows

ports/libgnutls/portfile.cmake

@@ -0,0 +1,35 @@
+set(GNUTLS_BRANCH 3.6)
+set(GNUTLS_VERSION ${GNUTLS_BRANCH}.15)
+set(GNUTLS_HASH f757d1532198f44bcad7b73856ce6a05bab43f6fb77fcc81c59607f146202f73023d0796d3e1e7471709cf792c8ee7d436e19407e0601bc0bda2f21512b3b01c)
+
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://www.gnupg.org/ftp/gcrypt/gnutls/v${GNUTLS_BRANCH}/gnutls-${GNUTLS_VERSION}.tar.xz"
+    FILENAME "gnutls-${GNUTLS_VERSION}.tar.xz"
+    SHA512 ${GNUTLS_HASH}
+)
+
+vcpkg_extract_source_archive_ex(
+    OUT_SOURCE_PATH SOURCE_PATH
+    ARCHIVE ${ARCHIVE}
+    REF ${GNUTLS_VERSION}
+)
+
+vcpkg_configure_make(
+    AUTOCONFIG
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        --disable-doc
+        --disable-silent-rules
+        --disable-tests
+        --disable-maintainer-mode
+        --disable-rpath
+        --with-included-unistring
+        --without-p11-kit
+)
+
+vcpkg_install_make()
+vcpkg_fixup_pkgconfig()
+vcpkg_copy_pdbs()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/share)
+file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)

ports/libtasn1/CONTROL

@@ -0,0 +1,5 @@
+Source: libtasn1
+Version: 4.16.0
+Homepage: https://www.gnutls.org/
+Description: A secure communications library implementing the SSL, TLS and DTLS protocols
+Supports: !windows

ports/libtasn1/portfile.cmake

@@ -0,0 +1,31 @@
+set(VERSION 4.16.0)
+
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://ftp.gnu.org/gnu/libtasn1/libtasn1-${VERSION}.tar.gz"
+    FILENAME "libtasn1-${VERSION}.tar.gz"
+    SHA512 b356249535d5d592f9b59de39d21e26dd0f3f00ea47c9cef292cdd878042ea41ecbb7c8d2f02ac5839f5210092fe92a25acd343260ddf644887b031b167c2e71
+)
+
+vcpkg_extract_source_archive_ex(
+   OUT_SOURCE_PATH SOURCE_PATH
+   ARCHIVE ${ARCHIVE} 
+   REF ${VERSION}
+)
+
+# restore the default ac_cv_prog_cc_g flags, otherwise it fails to compile
+set(VCPKG_C_FLAGS "-g -O2") 
+set(VCPKG_CXX_FLAGS "-g -O2")
+
+vcpkg_configure_make(
+    AUTOCONFIG
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        --disable-doc
+)
+
+vcpkg_install_make()
+vcpkg_fixup_pkgconfig() 
+vcpkg_copy_pdbs()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/share)
+file(INSTALL ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)

versions/baseline.json

@@ -3036,6 +3036,10 @@
       "baseline": "1.1.0",
       "port-version": 0
     },
+    "libgnutls": {
+      "baseline": "3.6.15",
+      "port-version": 0
+    },
     "libgo": {
       "baseline": "3.1-1",
       "port-version": 0
@@ -3440,6 +3444,10 @@
       "baseline": "323-1",
       "port-version": 0
     },
+    "libtasn1": {
+      "baseline": "4.16.0",
+      "port-version": 0
+    },
     "libtheora": {
       "baseline": "1.2.0alpha1-20170719",
       "port-version": 2

versions/l-/libgnutls.json

@@ -0,0 +1,9 @@
+{
+  "versions": [
+    {
+      "git-tree": "514174165bb692927e6af1b8d0ba877977760235",
+      "version-string": "3.6.15",
+      "port-version": 0
+    }
+  ]
+}

versions/l-/libtasn1.json

@@ -0,0 +1,9 @@
+{
+  "versions": [
+    {
+      "git-tree": "40e3f04762264c9abfbd1046a58e0e08768c45dd",
+      "version-string": "4.16.0",
+      "port-version": 0
+    }
+  ]
+}