edoc, syntax_tools: Don't fail on invalid UTF-8

As a temporary measure to ease the transition to default UTF-8
encoding, automatically fall back to the Latin-1 encoding (without any
warnings; the Erlang Compiler will emit a proper warning).

The intention is to remove this workaround in OTP 18 or 19.
rephrase sentence in process links doc
erts: Separate ethread inlining from ethread.h

The commit adb5dc0090bc419e2c4c1250653badbddeb6263b (ETHR_FORCE_INLINE)
broke some platforms without adequate thread support.
vxworks: Fix SYSTEMD_DAEMON_LIBS in configure
Merge branch 'hb/edoc/latin1_fix/OTP-12008' into maint-17

* hb/edoc/latin1_fix/OTP-12008:
  edoc, syntax_tools: Don't fail on invalid UTF-8
Merge branch 'egil/fix-ethr-force-inline/OTP-12010' into maint-17

* egil/fix-ethr-force-inline/OTP-12010:
  vxworks: Fix SYSTEMD_DAEMON_LIBS in configure
  erts: Separate ethread inlining from ethread.h
Prepare release
Updated OTP version
Merge branch 'maint-17' into maint
Merge branch 'maint'
Merge branch 'wmalik/processes-doc' into maint

* wmalik/processes-doc:
  rephrase sentence in process links doc
Merge branch 'maint'