Use Deimos OpenSSL instead of our own bindings

Remove a bit of duplication and allow users depending on this library
to use a more familiar way to configure the version of OpenSSL they
are using.

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "makd"]
 	path = submodules/makd
 	url = https://github.com/sociomantic-tsunami/makd.git
+[submodule "openssl"]
+	path = submodules/openssl
+	url = https://github.com/D-Programming-Deimos/openssl.git

Build.mak

@@ -7,7 +7,7 @@ TEST_RUNNER_MODULE := ocean.core.UnitTestRunner
 export ASSERT_ON_STOMPING_PREVENTION=1
 
 # Common D compiler flags
-override DFLAGS += -w -version=GLIBC
+override DFLAGS += -I$C/submodules/openssl/source/ -w -version=GLIBC
 
 # Treat deprecations as errors to ensure ocean doesn't use own deprecated
 # symbols internally. Disable it on explicit flag to make possible regression
@@ -18,7 +18,7 @@ endif
 
 # Enables https://github.com/sociomantic-tsunami/ocean/blob/v6.x.x/src/ocean/net/ssl/openssl/OpenSsl.d#L529
  ifeq ($(OPENSSL_V3),1)
-     override DFLAGS += -version=Ocean_OpenSSL3
+     override DFLAGS += -version=DeimosOpenSSL_3_0
  endif
 
 # Remove coverage files

dub.sdl

@@ -4,6 +4,7 @@ authors "Sociomantic Labs GmbH and Tango contributors"
 homepage "https://github.com/sociomantic-tsunami/ocean"
 license "BSD 3-clause or check Ocean license"
 copyright "Copyright (c) 2004 dunnhumby Germany GmbH and Tango contributors. All rights reserved."
+dependency "openssl" version="~>3.3"
 systemDependencies "Depending on the component used you might need one of the following libraries (check the used modules for details): -lglib-2.0 -lpcre -lxml2 -lxslt -lreadline -lhistory -llzo2 -lbz2 -lz -ldl -lgcrypt -lgpg-error -lrt -lebtree (version from https://github.com/sociomantic-tsunami/ebtree)"
 importPaths "src"
 targetType "sourceLibrary"

src/ocean/net/ssl/SslClientConnection.d

@@ -9,8 +9,10 @@
 
 module ocean.net.ssl.SslClientConnection;
 
+import deimos.openssl.err;
+import deimos.openssl.ssl;
+
 import ocean.meta.types.Qualifiers;
-import ocean.net.ssl.openssl.OpenSsl;
 import ocean.text.util.StringC;