[Toybox] [PATCH] head: add --bytes synonym for -c.

[enh]

Used by OTA package scripts in AOSP, and quite widely inside Google.

I've also added --lines because it seems crazy to support one and not
the other, and --lines is also widly used inside Google too.
---
 toys/posix/head.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toys/posix/head.c b/toys/posix/head.c
index 0cec403..7e34a71 100644
--- a/toys/posix/head.c
+++ b/toys/posix/head.c
@@ -6,7 +6,7 @@
  *
  * Deviations from posix: -c

-USE_HEAD(NEWTOY(head, "?n#<0=10c#<0qv[-nc]", TOYFLAG_USR|TOYFLAG_BIN))
+USE_HEAD(NEWTOY(head, "?n(lines)#<0=10c(bytes)#<0qv[-nc]",
TOYFLAG_USR|TOYFLAG_BIN))

 config HEAD
   bool "head"
-- 
2.20.0.rc0.387.gc7a69e6b6c-goog
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