Conditionally define TCP_ULP, SOL_TCP and SOL_TLS

Summary: `//xplat/fizz/experimental/ktls` doesn't compile with `arvr/mode/linux/anywhere/opt` without this as these aren't defined. Followed a common solution throughout our codebase where we conditionally set these, e.g. https://fburl.com/code/yftyxi7x

Reviewed By: markhog

Differential Revision: D59614368

fbshipit-source-id: 6afb60fc89c71e764c40e507bc29a3e59d7a0d96

fizz/experimental/ktls/LinuxKTLS.h

@@ -114,4 +114,16 @@
 #define TLS_CIPHER_AES_GCM_256_REC_SEQ_SIZE 8
 #endif
 
+#ifndef TCP_ULP
+#define TCP_ULP 31
+#endif
+
+#ifndef SOL_TCP
+#define SOL_TCP 6
+#endif
+
+#ifndef SOL_TLS
+#define SOL_TLS 282
+#endif
+
 #endif