MDEV-4718 Test "outfile_loaddata" fails on bigendian arches (ppc64)

for field terminators, uchar was compared with char

mysql-test/r/outfile_loaddata.result

@@ -143,15 +143,8 @@ TRUNCATE t2;
 LOAD DATA INFILE 'MYSQLTEST_VARDIR/tmp/t1.txt' INTO TABLE t2 CHARACTER SET binary FIELDS TERMINATED BY 'ъ';
 Warnings:
 Warning	1638	Non-ASCII separator arguments are not fully supported
-Warning	1265	Data truncated for column 'a' at row 1
-Warning	1261	Row 1 doesn't contain data for all columns
-Warning	1261	Row 1 doesn't contain data for all columns
-Warning	1265	Data truncated for column 'a' at row 2
-Warning	1261	Row 2 doesn't contain data for all columns
-Warning	1261	Row 2 doesn't contain data for all columns
 SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a, b, c;
 a	b	c
-1	NULL	NULL
 1	ABC-АБВ	DEF-ÂÃÄ
 2	NULL	NULL
 SELECT * FROM t1 INTO OUTFILE 'MYSQLTEST_VARDIR/tmp/t1.txt' LINES STARTING BY 'ъ';
@@ -181,7 +174,6 @@ Warning	1638	Non-ASCII separator arguments are not fully supported
 SELECT * FROM t1 UNION SELECT * FROM t2 ORDER BY a, b, c;
 a	b	c
 1	ABC-АБВ	DEF-ÂÃÄ
-1	ABC-АБВ	DEF-ÂÃÄÑŠ2
 2	NULL	NULL
 # Default (binary) charset:
 SELECT * INTO OUTFILE 'MYSQLTEST_VARDIR/tmp/t1.txt' FROM t1;

sql/sql_load.cc

@@ -1425,7 +1425,7 @@ inline int READ_INFO::terminator(char *ptr,uint length)
   uint i;
   for (i=1 ; i < length ; i++)
   {
-    if ((chr=GET) != *++ptr)
+    if ((chr=GET) != *(uchar*)++ptr)
     {
       break;
     }