gcc-target: Create a LTO plugin symlink in bfd-plugins directory

This directory is scanned by binutils provided ar,ranlib,nm for plugins
that it can load automatically, putting liblto_plugin.so in their means
we do not need gcc-ar, gcc-nm, gcc-ranlib particularly as normal
ar/ranlib/nm tools will work equally well as they can now use this
linker plugin by default

This also mean we can revert back to using ar/ranlib/nm as default
providers for AR/NM/RANLIB on target

(From OE-Core rev: 5aae5812223792d5e5bd57e024de50fbcd1e6da5)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gcc/gcc-target.inc

@@ -54,6 +54,7 @@ FILES_${PN} = "\
     ${gcclibdir}/${TARGET_SYS}/${BINV}/lib*${SOLIBS} \
     ${gcclibdir}/${TARGET_SYS}/${BINV}/include \
     ${gcclibdir}/${TARGET_SYS}/${BINV}/include-fixed \
+    ${libdir}/bfd-plugins/*.so \
 "
 INSANE_SKIP_${PN} += "dev-so"
 RRECOMMENDS_${PN} += "\
@@ -215,7 +216,8 @@ do_install () {
 	ln -sf ${bindir}/${TARGET_PREFIX}cpp ${D}${base_libdir}/cpp
 	ln -sf g++ c++
 	ln -sf gcc cc
-
+	install -d ${D}${libdir}/bfd-plugins
+	ln -sf ${libexecdir}/gcc/${TARGET_SYS}/${BINV}/liblto_plugin.so ${D}${libdir}/bfd-plugins/liblto_plugin.so
 	chown -R root:root ${D}
 }