amdgcn: Remove redundant multilib

2020-02-05  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* config/gcn/t-gcn-hsa (MULTILIB_OPTIONS): Use / not space.

gcc/ChangeLog

+2020-02-05  Andrew Stubbs  <ams@codesourcery.com>
+
+	* config/gcn/t-gcn-hsa (MULTILIB_OPTIONS): Use / not space.
+
 2020-02-05  David Malcolm  <dmalcolm@redhat.com>
 
 	* doc/analyzer.texi

gcc/config/gcn/t-gcn-hsa

@@ -42,7 +42,7 @@ ALL_HOST_OBJS += gcn-run.o
 gcn-run$(exeext): gcn-run.o
 	+$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ $< -ldl
 
-MULTILIB_OPTIONS = march=gfx900 march=gfx906
+MULTILIB_OPTIONS = march=gfx900/march=gfx906
 MULTILIB_DIRNAMES = gfx900 gfx906
 
 PASSES_EXTRA += $(srcdir)/config/gcn/gcn-passes.def