improve toxcore cmake and add flake

src/CMakeLists.txt

@@ -0,0 +1,11 @@
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+
+add_executable(totato
+	./main.cpp
+)
+
+target_compile_features(totato PUBLIC cxx_std_17)
+target_link_libraries(totato PUBLIC
+	toxcore
+)
+

src/main.cpp

@@ -0,0 +1,3 @@
+int main(void) {
+	return 0;
+}