Check `windres` message using the found `windres` only if needed #411

Job	Run time
make (check, cppflags=-DVM_CHECK_MODE)	8m 0s
make (check, i686)	43m 28s
make (check, --disable-yjit)	6m 31s
make (check, --enable-shared --enable-load-relative)	6m 31s
make (test-all TESTS=--repeat-count=2)	14m 50s
make (test-all, cppflags=-DUNIVERSAL_PARSER)	5m 55s
make (test-bundler-parallel)	20m 58s
make (test-bundled-gems)	16m 46s
Ubuntu result	1s
	2h 3m 0s

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