isc_file_fseek(), isc_file_fread(), isc_file_fwrite(),
                        isc_file_fflush(), isc_file_ffsync(), isc_file_remove()
                        to encapsulate nonportable usage of errno and fflush().

Add nslookup.c; non-functional and not compiled by make all.

			 stage.

functions that have builtins to be properly noticed.

  user can define EXT_CFLAGS on either the command line or in the environment.

cc: "mem.c", line 173: warning 714: Function "malloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 180: warning 714: Function "malloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 188: warning 714: Function "free_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 194: warning 714: Function "free_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 205: warning 714: Function "malloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 212: warning 714: Function "malloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 222: warning 714: Function "realloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 228: warning 714: Function "realloc_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 236: warning 714: Function "free_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 242: warning 714: Function "free_debug_func" called with no prototype or definition in scope.
cc: "mem.c", line 258: warning 714: Function "set_debug_options_func" called with no prototype or definition in scope.
cc: "mem.c", line 264: warning 714: Function "get_debug_options_func" called with no prototype or definition in scope.

cc: "stack.c", line 231: warning 714: Function called with no prototype or definition in scope.
cc: "stack.c", line 275: warning 714: Function "func" called with no prototype or definition in scope.

cc: "lhash.c", line 294: warning 714: Function "func" called with no prototype or definition in scope.
cc: "lhash.c", line 401: warning 714: Function called with no prototype or definition in scope.
cc: "lhash.c", line 422: warning 714: Function called with no prototype or definition in scope.

cc: "algchoic.h", line 74: warning 617: Redeclaration of tag "B_AlgorithmInfoType" ignored.
cc: "algchoic.h", line 74: warning 617: Redeclaration of tag "B_AlgorithmInfoType" ignored.

by removing:

struct B_AlgorithmInfoType;

because balgmeth.h already defines that struct tag.
(So does balg.h, but that isn't causing warnings.)

	warning 541: Integer overflow during conversion.
when their own SIO* macros are used in ioctl calls.

Added 1.2.3.4-> 4.3.2.1.in-addr.arpa translation to host
Added +defname, +aaonly, +cmd, +nostats, +qr flags to dig
Reviewed (and changed) result codes of dig.

Error messages changed to 'cannot redefine xxx'

	 * Compilers that use an older prototype for recvfrom() will
	 * warn about the type of the sixth parameter, fromlen.  It
	 * is now standardized as unsigned, specifically as socklen_t.
	 */

(... but the code itself still uses unsigned int.  This comment was added
because HP/UX is complaining now even as other compilers stopped complaining
when it was changed from signed int to unsigned int.)

compilers do not warn about the missing str*/mem* prototypes.

because it was causing HP/UX to barf up eight lines of:

cc: "adb.c", line 2219: warning 509: Condition always evaluates to true: If clause will always be executed.

missing.