gcc: add gcc-{ar,nm,ranlib} to $binDir, needed for LTO to work.

sys-devel/gcc/gcc-7.3.0_2018_05_01.recipe

@@ -5,7 +5,7 @@ HOMEPAGE="https://gcc.gnu.org/"
 COPYRIGHT="1988-2018 Free Software Foundation, Inc."
 LICENSE="GNU GPL v3
 	GNU LGPL v3"
-REVISION="2"
+REVISION="3"
 gccVersion="${portVersion%%_*}"
 SOURCE_URI="https://ftpmirror.gnu.org/gcc/gcc-$gccVersion/gcc-$gccVersion.tar.xz
 	https://ftp.gnu.org/gnu/gcc/gcc-$gccVersion/gcc-$gccVersion.tar.xz"
@@ -379,7 +379,7 @@ INSTALL()
 
 	# make all tools available via default paths
 	mkdir -p $binDir
-	for f in c++ cc cpp g++ gcc gcov gfortran; do
+	for f in c++ cc cpp g++ gcc gcov gfortran gcc-ar gcc-nm gcc-ranlib; do
 		symlinkRelative -sfn $installDir/bin/$f $binDir
 	done