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awk: Make -F '' and -v FS="" behave the same

IEEE Std 1003.1-2008 mandates that -F str be treated the same as -v
FS=str. For a null string, this was not the case. Since awk(1) documents
that a null string for FS has a specific behavior, make -F '' behave
consistently with -v FS="".

PR:
upstream issue:		https://github.com/onetrueawk/awk/issues/127
Sponsored by:		Netflix

--- a/main.c

+++ b/main.c

@@ -91,9 +91,7 @@

 	/* wart: t=>\t */

 	if (p[0] == 't' && p[1] == '\0')

 		return "\t";

-	else if (p[0] != '\0')

-		return p;

-	return NULL;

+	return p;

 }

 static char *

@@ -169,8 +167,6 @@

  			break;

 		case 'F':	/* set field separator */

 			fs = setfs(getarg(&argc, &argv, "no field separator"));

-			if (fs == NULL)

-				WARNING("field separator FS is empty");

 			break;

 		case 'v':	/* -v a=1 to be done NOW.  one -v for each */

 			vn = getarg(&argc, &argv, "no variable name");

-- 

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