funclib: refactor quoting methods a bit

From now we have two basic functions to perform string quoting for
shell evaluation -- 'func_quote_arg' to quote one argument and
'func_quote' which takes list of arguments to be quoted.

New function name-scheme should be more descriptive (previously we
called func_quote_for_eval with one argument and also multiple
arguments, while we had confusing
$func_quote_for_eval_unquoted_result which is redundant for
multiple-arguments call).

New abstraction allowed us (in an easy way) to implement
bash-specific optimization for quoting  (using
'printf -v VARNAME %q "$value"', suggested by Eric Blake), this
construct may be used on those places where we don't care much
about the result aesthetics (its thus not useful for '*.la'
generation or for error printing).

* gl/build-aux/funclib.sh (func_append_quoted): Use
func_quote_arg internally (kept in 'pretty' mode for now).
(func_quote): Made to be "main" high-level quoting method taking
list of arguments to be quoted into single command.  It replaces
func_quote_for_{expand,eval}.
(func_quote_portable): Implements quoting in shell, falling back
to portable sed call (rare cases).
(func_quotefast_eval): New internal function using fast
bash-specific construct, falling back to func_quote_portable for
non-Bash scripts.
(func_quote_arg): New function to quote one argument.
(func_quote_for_eval): Removed.  All callers changed to call
func_quote.
(func_quote_for_expand): Likewise.
* bootstrap: Sync with funclib.sh and options-parser.

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