Move the declaration of `rb_path_check` #578

Job	Run time
omnibus compilations, trigger	1s
omnibus compilations, #4	6m 40s
omnibus compilations, #2	30m 51s
omnibus compilations, #3	26m 25s
omnibus compilations, #1	29m 5s
omnibus compilations, #5	26m 37s
omnibus compilations, #6	26m 20s
omnibus compilations, #7	26m 4s
omnibus compilations, #8	26m 44s
omnibus compilations, #9	26m 25s
omnibus compilations, #11	26m 47s
omnibus compilations, #12	24m 31s
omnibus compilations, #10	26m 29s
omnibus compilations, result	1s
	5h 3m 0s

Provide feedback