workaround to unblock build

Summary: #346

Reviewed By: mjoras

Differential Revision: D25135783

fbshipit-source-id: 98285774caf15b609d719a7d2f0cb5efb3a7b7d6

Author: lnicco

CMakeLists.txt

@@ -65,8 +65,11 @@ endif()
 find_package(fmt REQUIRED)
 find_package(folly REQUIRED)
 find_package(wangle REQUIRED)
-find_package(Fizz REQUIRED)
-find_package(mvfst QUIET)
+if (BUILD_QUIC)
+  find_package(mvfst REQUIRED)
+else()
+ find_package(Fizz REQUIRED)
+endif()
 find_package(Zstd REQUIRED)
 find_package(ZLIB REQUIRED)
 find_package(OpenSSL REQUIRED)