fix: add temporary fix to compile with V 0.3.3

src/openssl.c.v

@@ -0,0 +1,5 @@
+// With V 0.3.3, Vieter fails to compile without this fix, as provided by
+// spytheman. It will get fixed in V itself, but this temporary fix allows me
+// to stay on V 0.3.3.
+[typedef]
+pub struct C.SSL_CTX{}