ngtcp2 build fix

-std=c99 breaks ngtcp2's build -- it appears to depend on GNU extensions
when compiling on linux, so don't force compiler C extensions off.

CMakeLists.txt

@@ -102,9 +102,8 @@ include(CheckLibraryExists)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
-set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED ON)
-set(CMAKE_C_EXTENSIONS OFF)
 
 include(cmake/target_link_libraries_system.cmake)
 include(cmake/add_import_library.cmake)

llarp/CMakeLists.txt

@@ -513,7 +513,6 @@ target_link_libraries(lokinet-util PUBLIC
 )
 
 target_link_libraries(lokinet-plainquic PUBLIC
-  ngtcp2_crypto
   quic
   uvw
 )