[build] fix a couple of build issues

src/Makefile.am

@@ -297,6 +297,7 @@ nodist_libdiag_a_SOURCES = \
 	$(LNAV_BUILT_FILES)
 
 THIRD_PARTY_SRCS = \
+    third-party/backward-cpp/backward.hpp \
 	third-party/sqlite/ext/dbdump.c \
 	third-party/sqlite/ext/series.c
 

src/curl_looper.hh

@@ -50,7 +50,7 @@ public:
     };
 };
 
-class curl_looper : public isc::service {
+class curl_looper : public isc::service<curl_looper> {
 public:
     void start() { };
     void stop() { };