rpm: fix lto-no-text-in-archive

opensuse 16 builds fail with the following issue:

    [  100s] naemon-devel.aarch64: E: lto-no-text-in-archive (Badness: 10000) /usr/lib64/naemon/libnaemon.a
    [  100s] This archive does not contain a non-empty .text section.  The archive was not
    [  100s] created with -ffat-lto-objects option.

    [  100s] naemon-devel.aarch64: E: lto-bytecode (Badness: 10000) /usr/lib64/naemon/libnaemon.a
    [  100s] This executable contains a LTO section.  LTO bytecode is not portable and
    [  100s] should not be distributed in static libraries or e.g. Python modules.

the recommended fix is to extend the _lto_cflags macro.

Author: sni

naemon-core.spec

@@ -50,6 +50,9 @@ Requires(pre): shadow
 %if 0%{?suse_version} < 1315
 Requires(pre): shadow-utils
 %endif
+
+# satisfy opensuse 16 rpmlint issue: E: lto-no-text-in-archive
+%global _lto_cflags %{?_lto_cflags} -ffat-lto-objects
 %endif
 Requires:  logrotate
 Requires:  libnaemon >= %{version}