rc-misc: Allow EINFO_COLOR through env_filter()

This allows rc-service -C <service> <action> to properly not print color
messages.

Fixes #93

src/rc/rc-misc.c

@@ -53,6 +53,7 @@ static const char *const env_whitelist[] = {
 	"EERROR_QUIET", "EINFO_QUIET",
 	"IN_BACKGROUND", "IN_HOTPLUG",
 	"LANG", "LC_MESSAGES", "TERM",
+	"EINFO_COLOR",
 	NULL
 };