Some warnings from the compiler

[Bjarni Ingi Gislason]

                           Groff Bug Report

Send the completed form to address@hidden

GROFF VERSION:
1.22.3

MACHINE:
GA-E350N WIN8 from Gigabyte

OS:
Linux 3.16.36-1  (Debian, own compilation)

COMPILER:
gcc, g++ (Debian 5.4.0-6) 5.4.0 20160609

INPUT FILES:
Click on "groff-master.tar.gz" on the web-page 
"git.savannah.gnu.org/cgit/groff.git/commit/
(from 26th July 2016)

COMMAND LINE:
  All the compilation steps

DESCRIPTION OF INCORRECT BEHAVIOUR:
  Warnings from the compiler:

src/libs/libbib/map.c:39:7: warning: no previous prototype for 'mapread' 
[-Wmissing-prototypes]
 char *mapread(int fd, int nbytes)
       ^
src/libs/libbib/map.c:51:5: warning: no previous prototype for 'unmap' 
[-Wmissing-prototypes]
 int unmap(char *p, int len)
     ^
src/libs/libgroff/getopt.c:251:25: warning: unused parameter 'argc' 
[-Wunused-parameter]
 _getopt_initialize (int argc, char **argv, const char *optstring,
                         ^
src/libs/libgroff/getopt.c:251:38: warning: unused parameter 'argv' 
[-Wunused-parameter]
 _getopt_initialize (int argc, char **argv, const char *optstring,
                                      ^
src/libs/libgroff/quotearg.c:85:1: warning: no previous prototype for 
'quote_arg' [-Wmissing-prototypes]
 quote_arg(char *string)
 ^
src/libs/libgroff/quotearg.c:188:1: warning: no previous prototype for 
'purge_quoted_args' [-Wmissing-prototypes]
 purge_quoted_args(char **argv)
 ^
src/roff/groff/pipeline.c:445:5: warning: no previous prototype for 
'run_pipeline' [-Wmissing-prototypes]
 int run_pipeline(int ncommands, char ***commands, int no_pipe)
     ^
src/utils/indxbib/signal.c:53:6: warning: no previous prototype for 
'catch_fatal_signals' [-Wmissing-prototypes]
 void catch_fatal_signals(void)
      ^

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