textproc/2bsd-diff: fix breakage on current

On FreeBSD 13 - current, the build failed with:

cc: error: unknown argument: '-i'

PR:     234362
Submitted by:   risner@stdio.com (maintainer)

1 files changed, 45 insertions, 4 deletions

diff --git a/textproc/2bsd-diff/files/patch-diff.c b/textproc/2bsd-diff/files/patch-diff.c
index 6be748081b3d..75101455b3f4 100644
--- a/textproc/2bsd-diff/files/patch-diff.c
+++ b/textproc/2bsd-diff/files/patch-diff.c
@@ -1,6 +1,31 @@
---- diff.c.orig	Wed Nov 13 05:31:26 1991
-+++ diff.c	Wed Mar 19 01:31:23 2003
-@@ -176,9 +176,10 @@
+--- diff.c.orig	1991-11-12 20:31:26 UTC
++++ diff.c
+@@ -11,7 +11,7 @@ char	diff[] = DIFF;
+ char	diffh[] = DIFFH;
+ char	pr[] = PR;
+ 
+-main(argc, argv)
++int main(argc, argv)
+ 	int argc;
+ 	char **argv;
+ {
+@@ -162,23 +162,24 @@ savestr(cp)
+ 	return (dp);
+ }
+ 
+-min(a,b)
++int min(a,b)
+ 	int a,b;
+ {
+ 
+ 	return (a < b ? a : b);
+ }
+ 
+-max(a,b)
++int max(a,b)
+ 	int a,b;
+ {
+ 
  	return (a > b ? a : b);
  }
  
@@ -12,7 +37,15 @@
  		unlink(tempfile);
  	exit(status);
  }
-@@ -198,7 +199,6 @@
+@@ -191,6 +192,7 @@ talloc(n)
+ 	if ((p = malloc((unsigned)n)) != NULL)
+ 		return(p);
+ 	noroom();
++	return NULL;
+ }
+ 
+ char *
+@@ -198,14 +200,13 @@ ralloc(p,n)
  char *p;
  {
  	register char *q;
@@ -20,3 +53,11 @@
  
  	if ((q = realloc(p, (unsigned)n)) == NULL)
  		noroom();
+ 	return(q);
+ }
+ 
+-noroom()
++void noroom()
+ {
+ 	fprintf(stderr, "diff: files too big, try -h\n");
+ 	done();