Fix underlinking on ghc-prim.
Fixes ghc-stage2 crahs on hardened toolchain.
Reported-by: aranea
diff --git a/libraries/ghc-prim/ghc-prim.cabal b/libraries/ghc-prim/ghc-prim.cabal
index ffb32af..0431380 100644
--- a/libraries/ghc-prim/ghc-prim.cabal
+++ b/libraries/ghc-prim/ghc-prim.cabal
@@ -65,3 +65,7 @@ Library
     -- We need to set the package name to ghc-prim (without a version number)
     -- as it's magic.
     ghc-options: -package-name ghc-prim
+
+    -- ghc 'sin' (and other) primops generate 'libm' calls,
+    -- but ghc itself does not add '-lm'
+    extra-libraries: m