sci-chemistry/mopac7: mark as LTO-unsafe

Unmaintained, treecleaning candidate. Still, it is unsafe so say so.

Closes: https://bugs.gentoo.org/927389
Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

sci-chemistry/mopac7/mopac7-1.15-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -39,6 +39,12 @@ src_prepare() {
 }
 
 src_configure() {
+	# -Werror=lto-type-mismatch
+	# https://bugs.gentoo.org/927389
+	#
+	# Unmaintained fortran code, no bug report.
+	filter-lto
+
 	econf --disable-static
 }