sys-apps/gradm: filter LTO

Complicated upstream situation so cannot test a newer version. LTO type mismatch.

Closes: https://bugs.gentoo.org/863569
Signed-off-by: Sam James <sam@gentoo.org>

sys-apps/gradm/gradm-3.1.201903191516.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=7
 
-inherit toolchain-funcs udev
+inherit flag-o-matic toolchain-funcs udev
 
 MY_PV="$(ver_rs 2 -)"
 
@@ -37,6 +37,9 @@ src_compile() {
 	local target
 	use pam || target="nopam"
 
+	# bug #863569
+	filter-lto
+
 	emake ${target} CC="$(tc-getCC)" OPT_FLAGS="${CFLAGS}"
 }