Enable LTO; Set fortify to level 2

Disabling LTO removed TEXTRELs, let's try fortify level 2 now (default 3
in Fedora 38).

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

systemd.spec

@@ -19,11 +19,7 @@
 # e.g. when re-building cryptsetup on a json-c SONAME-bump.
 %bcond_with    bootstrap
 %bcond_without tests
-%ifnarch riscv64
 %bcond_without lto
-%else
-%bcond_with lto
-%endif
 
 # Support for quick builds with rpmbuild --build-in-place.
 # See README.build-in-place.
@@ -37,7 +33,7 @@ Version:        253.2
 # determine the build information from local checkout
 Version:        %(tools/meson-vcs-tag.sh . error | sed -r 's/-([0-9])/.^\1/; s/-g/_g/')
 %endif
-Release:        %autorelease -e 4.riscv64
+Release:        %autorelease -e 5.riscv64
 
 %global stable %(c="%version"; [ "$c" = "${c#*.*}" ]; echo $?)
 
@@ -668,6 +664,10 @@ fi
 %global _lto_cflags %nil
 %endif
 
+%ifarch riscv64
+%define _fortify_level 2
+%endif
+
 # Do configuration. If doing an inplace build, try to do
 # reconfiguration to pick up new options.
 %if %{with inplace}