Undo the parts of the unlocked-I/O change that substituted

Undo the parts of the unlocked-I/O change that substituted
putc or puts for printf.  This might hurt performance a bit,
but some people prefer the printf style.
* data/c.m4 (yysymprint): Prefer printf to puts and putc.
* data/glr.c (YYFPUTC, YYFPUTS, YYDPUTS): Remove.
All uses replaced by YYFPRINTF and YYDPRINTF.
* data/yacc.c: Likewise.
* lib/bitset.c (bitset_print): Likewise.
* lib/bitsetv.c (bitsetv_dump, debug-bitsetv): Prefer printf to
putc and puts.
* lib/lbitset.c (debug_lbitset): Likewise.
* src/closure.c (print_firsts, print_fderives): Likewise.
* src/gram.c (grammar_dump): Likewise.
* src/lalr.c (look_ahead_tokens_print): Likewise.
* src/output.c (escaped_output): Likewise.
(user_actions_output): Break apart two printfs.
* src/parse-gram.y (%printer): Prefer printf to putc and puts.
* src/reduce.c (reduce_print): Likewise.
* src/state.c (state_rule_look_ahead_tokens_print): Likewise.
* src/system.h: Include unlocked-io.h rathe than stdio.h.