regcomp.c, toke.c: swap functions being inline static

regcomp.c, toke.c: swap functions being inline static

grok_bslash_x() is so large that no compiler will inline it.  Move it to
dquote.c from dq_inline.c.  Conversely, move form_octal_warning() to
dq_inline.c.  It is so tiny that the function call overhead is scarcely
smaller than the function body.

This also moves things in embed.fnc so all these functions.  are not
visible outside the few files they are supposed to be used in.