testsuite: check CONFIG_DESKTOP before using 'od -t'

The '-t' option for od is enabled by CONFIG_DESKTOP. So
check this config before using 'od -t' in test cases.

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/echo/echo-prints-dash

@@ -1 +1,2 @@
+# FEATURE: CONFIG_DESKTOP
 test "`busybox echo - | od -t x1 | head -n 1`" = "0000000 2d 0a"

testsuite/echo/echo-prints-non-opts

@@ -1 +1,2 @@
+# FEATURE: CONFIG_DESKTOP
 test "`busybox echo -neEZ | od -t x1 | head -n 1`" = "0000000 2d 6e 65 45 5a 0a"

testsuite/echo/echo-prints-slash-zero

@@ -1,3 +1,3 @@
-# FEATURE: CONFIG_FEATURE_FANCY_ECHO
+# FEATURE: CONFIG_FEATURE_FANCY_ECHO CONFIG_DESKTOP
 
 test "`busybox echo -e -n 'msg\n\0' | od -t x1 | head -n 1`" = "0000000 6d 73 67 0a 00"

testsuite/echo/echo-prints-slash_00041

@@ -1,3 +1,3 @@
-# FEATURE: CONFIG_FEATURE_FANCY_ECHO
+# FEATURE: CONFIG_FEATURE_FANCY_ECHO CONFIG_DESKTOP
 
 test "`busybox echo -ne '\00041z' | od -t x1 | head -n 1`" = "0000000 04 31 7a"

testsuite/echo/echo-prints-slash_0041

@@ -1,3 +1,3 @@
-# FEATURE: CONFIG_FEATURE_FANCY_ECHO
+# FEATURE: CONFIG_FEATURE_FANCY_ECHO CONFIG_DESKTOP
 
 test "`busybox echo -ne '\0041z' | od -t x1 | head -n 1`" = "0000000 21 7a"

testsuite/echo/echo-prints-slash_041

@@ -1,3 +1,3 @@
-# FEATURE: CONFIG_FEATURE_FANCY_ECHO
+# FEATURE: CONFIG_FEATURE_FANCY_ECHO CONFIG_DESKTOP
 
 test "`busybox echo -ne '\041z' | od -t x1 | head -n 1`" = "0000000 21 7a"

testsuite/echo/echo-prints-slash_41

@@ -1,3 +1,3 @@
-# FEATURE: CONFIG_FEATURE_FANCY_ECHO
+# FEATURE: CONFIG_FEATURE_FANCY_ECHO CONFIG_DESKTOP
 
 test "`busybox echo -ne '\41z' | od -t x1 | head -n 1`" = "0000000 21 7a"