Change CSREQ to use non-cross-compiled Rust libs.

This behavior matches the other fulldeps tests. It is correct for the
plugin fulldeps tests, but it's wrong for the fulldeps programs that link
against rustc and run on the target.

Author: rprichard

mk/tests.mk

@@ -761,7 +761,7 @@ PRETTY_DIRNAME_pretty-bench = bench
 PRETTY_DIRNAME_pretty-pretty = pretty
 
 define DEF_PRETTY_FULLDEPS
-PRETTY_DEPS$(1)_T_$(2)_H_$(3)_pretty-rpass-full = $$(CSREQ$(1)_T_$(2)_H_$(3))
+PRETTY_DEPS$(1)_T_$(2)_H_$(3)_pretty-rpass-full = $$(CSREQ$(1)_T_$(3)_H_$(3))
 endef
 
 $(foreach host,$(CFG_HOST), \