Add Userspace-RCU to global CFLAGS and LIBS

The Userspace-RCU headers are now needed for more parts of the libisc
and libdns, thus we need to add it globally to prevent compilation
failures on systems with non-standard Userspace-RCU installation path.

configure.ac

@@ -244,6 +244,9 @@ AC_DEFINE_UNQUOTED([RCU_FLAVOR], ["$RCU_FLAVOR"], [Chosen Userspace-RCU flavor])
 PKG_CHECK_VERSION([RCU_VERSION], [$RCU_FLAVOR])
 AC_DEFINE_UNQUOTED([RCU_VERSION], ["$RCU_VERSION"], [Compile-time Userspace-RCU version])
 
+CFLAGS="$CFLAGS $LIBURCU_CFLAGS"
+LIBS="$LIBS $LIBURCU_LIBS"
+
 # Fuzzing is not included in pairwise testing as fuzzing tools are
 # not present in the relevant Docker image.
 #

lib/dns/Makefile.am

@@ -263,7 +263,6 @@ libdns_la_CPPFLAGS =		\
 	$(AM_CPPFLAGS)		\
 	$(LIBDNS_CFLAGS)	\
 	$(LIBISC_CFLAGS)	\
-	$(LIBURCU_CFLAGS)	\
 	$(LIBUV_CFLAGS)		\
 	$(OPENSSL_CFLAGS)
 
@@ -273,7 +272,6 @@ libdns_la_LDFLAGS =		\
 
 libdns_la_LIBADD =		\
 	$(LIBISC_LIBS)		\
-	$(LIBURCU_LIBS)		\
 	$(LIBUV_LIBS)		\
 	$(OPENSSL_LIBS)
 

lib/isc/Makefile.am

@@ -212,7 +212,6 @@ endif USE_ISC_RWLOCK
 libisc_la_CPPFLAGS =		\
 	$(AM_CPPFLAGS)		\
 	$(LIBISC_CFLAGS)	\
-	$(LIBURCU_CFLAGS)	\
 	$(LIBUV_CFLAGS)		\
 	$(OPENSSL_CFLAGS)	\
 	$(ZLIB_CFLAGS)
@@ -222,7 +221,6 @@ libisc_la_LDFLAGS =		\
 	-release "$(PACKAGE_VERSION)"
 
 libisc_la_LIBADD =		\
-	$(LIBURCU_LIBS)		\
 	$(LIBUV_LIBS)		\
 	$(OPENSSL_LIBS)		\
 	$(ZLIB_LIBS)