extract some basic code from libcryptonote_core into libcryptonote_basic

src/common/CMakeLists.txt

@@ -69,6 +69,7 @@ monero_add_library(common
   ${common_private_headers})
 target_link_libraries(common
   PUBLIC
+    epee
     crypto
     ${UNBOUND_LIBRARY}
     ${LIBUNWIND_LIBRARIES}

src/common/dns_utils.cpp

@@ -29,7 +29,7 @@
 #include "common/command_line.h"
 #include "common/i18n.h"
 #include "common/dns_utils.h"
-#include "cryptonote_core/cryptonote_basic_impl.h"
+#include "cryptonote_basic/cryptonote_basic_impl.h"
 #include <cstring>
 #include <sstream>
 // check local first (in the event of static or in-source compilation of libunbound)

src/common/dns_utils.h

@@ -29,7 +29,7 @@
 
 #include <vector>
 #include <string>
-#include "cryptonote_core/cryptonote_basic.h"
+#include "cryptonote_basic/cryptonote_basic.h"
 
 namespace tools
 {