Add support for building elogind against musl libc

* Check whether printf.h is available and define/undef HAVE_PRINTF_H
  accordingly.
* Added src/shared/parse-printf-format.[hc] by Emil Renner Berthing
  <systemd@esmil.dk> that provides parse_printf_format() if printf.h
  is unavailable
* Added src/basic/musl_missing.h by Juergen Buchmueller
  <pullmoll@t-online.de> that implements glibc functions missing in
  musl libc as macros.
* Extended src/basic/musl_missing.h and added
  src/basic/musl_missing.c providing
  - program_invocation_name
  - program_invocation_short_name and
  - elogind_set_program_name() to set the two where appropriate.
* Added calls to elogind_set_program_name() to all main() functions
  where needed.
* A few other fixes to work nicely with musl libc.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/cgroups-agent/cgroups-agent.c b/src/cgroups-agent/cgroups-agent.c
index e72c5c1e0..c0ce357f3 100644
--- a/src/cgroups-agent/cgroups-agent.c
+++ b/src/cgroups-agent/cgroups-agent.c
@@ -34,6 +34,7 @@ int main(int argc, char *argv[]) {
                 return EXIT_FAILURE;
         }
 
+        elogind_set_program_name(argv[0]);
         log_set_target(LOG_TARGET_AUTO);
         log_parse_environment();
         log_open();