Remove OpenSSL warnings ignore

If we include OpenSSL in extern "C" blocks consistently, c++ warnings no
longer appear.  This means we can remove the special case from meson.

Tested: Code compiles when built locally on an ubuntu 22.04 system.

Change-Id: I5add4113b32cd88b7fdd874174c845425a7c287a
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/include/ssl_key_handler.hpp b/include/ssl_key_handler.hpp
index d12fcab..d7255dd 100644
--- a/include/ssl_key_handler.hpp
+++ b/include/ssl_key_handler.hpp
@@ -8,7 +8,6 @@
 extern "C"
 {
 #include <nghttp2/nghttp2.h>
-}
 #include <openssl/bio.h>
 #include <openssl/dh.h>
 #include <openssl/dsa.h>
@@ -18,6 +17,7 @@
 #include <openssl/rand.h>
 #include <openssl/rsa.h>
 #include <openssl/ssl.h>
+}
 
 #include <boost/asio/ssl/context.hpp>