sci-libs/geos: don't filter LTO

It was fixed upstream in >=3.13.0. I do get the mysterious virtual issue
w/ -fno-semantic-interposition and LTO but ignoring that and just filtering
it in that case.

Bug: https://bugs.gentoo.org/862702
Signed-off-by: Sam James <sam@gentoo.org>

sci-libs/geos/geos-3.13.1.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=8
 
-inherit cmake flag-o-matic
+inherit cmake flag-o-matic toolchain-funcs
 
 DESCRIPTION="Geometry engine library for Geographic Information Systems"
 HOMEPAGE="https://libgeos.org/"
@@ -18,10 +18,7 @@ RESTRICT="!test? ( test )"
 BDEPEND="doc? ( app-text/doxygen )"
 
 src_configure() {
-	# -Werror=odr
-	# https://bugs.gentoo.org/862702
-	# https://github.com/libgeos/geos/issues/1054
-	filter-lto
+	tc-is-lto && filter-flags -fno-semantic-interposition
 
 	local mycmakeargs=(
 		-DBUILD_DOCUMENTATION=$(usex doc)