Fix bug #11519 with relocation of buffer text during regex search.
src/lisp.h [REL_ALLOC]: Add prototypes for external functions defined on ralloc.c. src/buffer.c [REL_ALLOC]: Remove prototypes of r_alloc_reset_variable, r_alloc, r_re_alloc, and r_alloc_free, they are now on lisp.h. src/ralloc.c (r_alloc_inhibit_buffer_relocation): New function. src/search.c (search_buffer): Use it to inhibit relocation of buffer text while re_search_2 is doing its job, because re_search_2 is passed C pointers to buffer text.
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