simplify link-cfg workaround

Author: mati865

src/test/run-make-fulldeps/link-cfg/Makefile

@@ -3,9 +3,7 @@
 all: $(call DYLIB,return1) $(call DYLIB,return2) $(call NATIVE_STATICLIB,return3)
 	ls $(TMPDIR)
 
-    ifneq ($(IS_MUSL_HOST),1)
-	    $(RUSTC) --print cfg --target x86_64-unknown-linux-musl | $(CGREP) crt-static
-    endif
+	$(BARE_RUSTC) --print cfg --target x86_64-unknown-linux-musl | $(CGREP) crt-static
 
 	$(RUSTC) no-deps.rs --cfg foo
 	$(call RUN,no-deps)