Make execline dependency optional

 This includes:
 - adding a configure option to disable execline support
 - duplicating el_semicolon() and el_getstrict() into the s6 library
when execline is disabled at build time, making a compat shim and
using it where needed (s6-svlisten, s6-ftrig-listen)
 - Creating alternatives for execlineb script spawning:
   * s6-log: '?' directive (done in the previous commit)
   * s6-notifyoncheck: require hardcoding the check in ./data/check
   * s6-ipcserver-access: no support for exec files, add a warning
 - Updating the relevant parts of the doc

 --enable-execline will remain the default, and whiners can choke
on their tears.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libs6/deps-lib/s6 b/src/libs6/deps-lib/s6
index 65612cc..ddd86dc 100644
--- a/src/libs6/deps-lib/s6
+++ b/src/libs6/deps-lib/s6
@@ -26,12 +26,13 @@ s6_accessrules_keycheck_uidgid.o
 s6_accessrules_params_free.o
 s6_accessrules_uidgid_cdb.o
 s6_accessrules_uidgid_fs.o
-s6_supervise_lock.o
-s6_supervise_lock_mode.o
+s6_compat_el_semicolon.o
 s6_dtally_pack.o
 s6_dtally_unpack.o
 s6_dtally_read.o
 s6_dtally_write.o
+s6_supervise_lock.o
+s6_supervise_lock_mode.o
 s6_svc_lock_take.o
 s6_svc_lock_release.o
 s6_svc_ok.o