DragonFlyBSD/src 70c1b09gnu/usr.bin/cc47/liblto_plugin Makefile, gnu/usr.bin/cc80/support-libs/liblto_plugin Makefile

gcc80: Make LTO plugins installation consistent.

Previously my LTO additions were (ab)using bug in bsd.lib.mk.
All other cases in world override both variables.
Do the same fix for gcc47 too.

No functional change intended.
DeltaFile
+1-0gnu/usr.bin/cc47/liblto_plugin/Makefile
+1-0gnu/usr.bin/cc80/support-libs/liblto_plugin/Makefile
+2-02 files

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