add nng cmake config.

Nng/CMakeLists.txt

@@ -1,4 +1,5 @@
 find_package(MbedTLS REQUIRED)
+find_package(nng CONFIG REQUIRED)
 
 add_library(Nng
     Buffer.h Buffer.cpp
@@ -11,17 +12,11 @@ add_library(Nng
 
 target_include_directories(Nng
     PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
-    PUBLIC ${NNG_INCLUDE_DIR}
     PUBLIC ${Boost_INCLUDE_DIRS}
 )
 
-target_link_directories(Nng
-    PUBLIC ${MBEDTLS_LIBRARY_DIRS}
-    PUBLIC ${NNG_LIBRARY_DIRS}
-)
-
 target_link_libraries(Nng
-    PUBLIC nng
+    PUBLIC nng::nng
     PUBLIC MbedTLS::mbedtls
     PUBLIC MbedTLS::mbedcrypto
     PUBLIC MbedTLS::mbedx509