[Toybox] [PATCH] pidof: fix default behavior, add -x.

[enh]

Before this patch, we're effectively doing `pidof -x` all the time. This
patch changes names_to_pid() to allow us to say whether or not we want to
include scripts, and adjusts the callers appropriately.

Also add tests for `pidof` versus `pidof -x` which pass after this
patch, without regressing the existing killall tests.
---
 lib/lib.c                 | 21 ++++++++++++---------
 lib/lib.h                 |  3 ++-
 tests/pidof.test          | 33 +++++++++++++++++++++++++++++++++
 toys/lsb/killall.c        |  2 +-
 toys/lsb/pidof.c          |  5 +++--
 toys/pending/bootchartd.c | 38 ++++++++++++--------------------------
 6 files changed, 63 insertions(+), 39 deletions(-)
 create mode 100644 tests/pidof.test
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