TCP Wrappers: tcpdchk (tcp wrapper configuration checker) and tcpdmatch

TCP Wrappers: tcpdchk (tcp wrapper configuration checker) and tcpdmatch
(tcp wrapper oracle) warning fixes via edits to the C code files

contrib/tcp_wrappers/fakelog.c
  Warnings for each of functions: openlog( ), vsyslog( ), VARARGS( ),
  closelog( )
    warning: type specifier missing, defaults to 'int' [-Wimplicit-int]
    warning: control reaches end of non-void function [-Wreturn-type]
  Fixes:
      Explicitly added specification of function type to void for each
        function, suppressing both warnings for each function listed
contrib/tcp_wrappers/inetcf.c
  Warnings:
      warning: incompativle redeclaration of library function 'malloc'
        note: 'malloc' is a builtin with type 'void *(unsigned long)'
      warning: implicit declaration of function 'check_path' is invalid in C99
        [-Wimplicit-function-declaration]
  Fixes:
      Removed redeclaration of malloc on line 21
      Included library <stdlib.h> in the code which contains the malloc( )
        function in it's library
      Included scaffold.h header file in the code that contains check-path( )
        function
contrib/tcp_wrappers/scaffold.c
  Warnings:
      warning: implicitly declaring library function 'exit' with type
        'void (int) __attribute__((noreturn))' [-Wimplicit-function-declaration]
      note: include the header <stdlib.h> or explicitly provide a declaration
        for 'exit'
  Fixes:
      Included <stdlib.h> in the code which contains the exit( ) function in
      it's library
contrib/tcp_wrappers/tcpdchk.c
  Warnings:
      warning: implicit declaration of function 'getopt' is invalid
        in C99 [-Wimplicit-function-declaration]
      warning: implicit declaration of function 'atoi' is invalid
        in C99 [-Wimplicit-function-declaration]
  Fixes:
      Included the specific function <getopt.h> library to the code
      Included<stdlib.h> to the code which contains the atoi( ) function in
        the library
contrib/tcp_wrappers/tcpdmatch.c
  Warnings:
      warning: implicit declaration of function 'getopt' is invalid in C99
        [-Wimplicit-function-declaration]
  Fixes:
      Included<stdlib.h> to the code which contains the getopt( ) function in
        the library

Submitted by:	Aaron Prieger <aprieger@llnw.com>
Reviewed by:	vangyzen
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D10995