Remove the MAX_CHECK macro, it was initially used to test if a file was a

text file or not.

The check is not done by diff3 but by diff (the argument -a is directly passed
to diff(1))

usr.bin/diff3/diff3.c

@@ -149,10 +149,8 @@ enum {
 	STRIPCR_OPT,
 };
 
-#define MAX_CHECK 768	/* 3 kb of chars */
 #define DIFF_PATH "/usr/bin/diff"
 
-
 #define OPTIONS "3aAeEiL:mTxX"
 static struct option longopts[] = {
 	{ "ed",			no_argument,		NULL,	'e' },