mod_netconf: fixed problem with RPM generation

configure script initializes CFLAGS variable with '-O2' flag that is
unknown to apxs -> rewrite with new value

- refs #643
diff --git a/src/mod_netconf.spec.in b/src/mod_netconf.spec.in
index 88bc5cf..0d8b976 100644
--- a/src/mod_netconf.spec.in
+++ b/src/mod_netconf.spec.in
@@ -20,7 +20,7 @@
 %setup
 
 %build
-%configure --with-distro=@DISTRO@ @LIBNETCONF_WITH@ --with-notifications;
+%configure @LIBNETCONF_WITH@;
 make
 
 %install