[glib] (9 commits) ...Merge branch '2140-spawn-async-signal-safety' into 'master'

[Sebastian Dröge <sdroege src gnome org>]

Summary of changes:

  0e05ef7... gspawn: Audit for async-signal-safety
  6f46294... gspawn: Don’t use g_close() in async-signal-safe context
  3394892... gspawn: Don’t use g_ascii_isdigit() in async-signal-safe 
  1051bfe... gspawn: Don’t use g_assert() in async-signal-safe context
  84f188a... gspawn: Don’t use getrlimit() or sysconf() in async-signa
  62ce66d... gspawn: Don’t use getenv() in async-signal-safe context
  cf5af28... gspawn: Don’t use malloc() when searching for a binary
  dd36248... gspawn: Don’t use malloc() when running a binary under /b
  e48e144... Merge branch '2140-spawn-async-signal-safety' into 'master'