Enable the mangler for netbsd/amd64; fixes trac #2347

driver/mangler/ghc-asm.lprl

@@ -216,7 +216,7 @@ sub init_TARGET_STUFF {
     $T_HDR_vector   = "\.text\n\t\.align 8\n";
 
     #--------------------------------------------------------#
-    } elsif ( $TargetPlatform =~ /^x86_64-.*-(linux|openbsd|freebsd)$/m ) {
+    } elsif ( $TargetPlatform =~ /^x86_64-.*-(linux|openbsd|freebsd|netbsd)$/m ) {
 
     $T_STABBY       = 0; # 1 iff .stab things (usually if a.out format)
     $T_US           = ''; # _ if symbols have an underscore on the front