Use relative include paths for OpenSSL and zlib in QUICHE.

We use those in Envoy, and those should also work in Chromium (otherwise third-party libraries depending on those would fail to compile).

PiperOrigin-RevId: 440992054
diff --git a/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc b/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc
index dcfb523..d71804c 100644
--- a/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc
+++ b/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc
@@ -4,7 +4,7 @@
 
 #include "quiche/quic/core/crypto/chacha20_poly1305_encrypter.h"
 
-#include "third_party/boringssl/src/include/openssl/evp.h"
+#include "openssl/evp.h"
 
 namespace quic {