auth geoipbackend: link C++ filesystem lib if necessary

Author: Habbie

configure.ac

@@ -309,11 +309,12 @@ LDFLAGS="$RELRO_LDFLAGS $LDFLAGS"
 
 CFLAGS="$PIE_CFLAGS $CFLAGS"
 CXXFLAGS="$PIE_CFLAGS $CXXFLAGS"
-PROGRAM_LDFLAGS="$PIE_LDFLAGS $PROGRAM_LDFLAGS"
 AS_IF([test "$ax_cxx_cv_filesystem_lib" != "none"],
- [PROGRAM_LDFLAGS="$PROGRAM_LDFLAGS -l$ax_cxx_cv_filesystem_lib"],
+ [CXXFS_LIBS="-l$ax_cxx_cv_filesystem_lib"],
  []
 )
+AC_SUBST([CXXFS_LIBS])
+PROGRAM_LDFLAGS="$PIE_LDFLAGS $PROGRAM_LDFLAGS $CXXFS_LIBS"
 AC_SUBST([PROGRAM_LDFLAGS])
 
 PDNS_ENABLE_COVERAGE

modules/geoipbackend/Makefile.am

@@ -11,4 +11,4 @@ libgeoipbackend_la_SOURCES = \
 	geoipinterface.cc geoipinterface.hh
 
 libgeoipbackend_la_LDFLAGS = -module -avoid-version
-libgeoipbackend_la_LIBADD = $(YAML_LIBS) $(GEOIP_LIBS) $(MMDB_LIBS)
+libgeoipbackend_la_LIBADD = $(YAML_LIBS) $(GEOIP_LIBS) $(MMDB_LIBS) $(CXXFS_LIBS)