erts: Prevent valgrind from repeating same memory leaks reports

by using the macro VALGRIND_DO_ADDED_LEAK_CHECK if it exists
for system_info({error_checker,memory})
fixed small typo (missing right parenthesis) in gen_fsm example
Merge branch 'sverk/valgrind-added-leak-check' into maint

* sverk/valgrind-added-leak-check:
  erts: Prevent valgrind from repeating same memory leaks reports
Merge branch 'maint'
add erl-xcom-arm-linux.conf
Merge branch 'henrik/xcomp-arm' into maint
Merge branch 'maint'
erl_docgen: fix code highlighting and warning and note parts in erl_docgen
Merge branch 'fredrik/doc/syntax_highlight/OTP-11237' into maint

* fredrik/doc/syntax_highlight/OTP-11237:
  erl_docgen: fix code highlighting and warning and note parts in erl_docgen
Merge branch 'maint'
Merge branch 'bsmr-erlang/fix_gen_fsm_example/OTP-11472' into maint

* bsmr-erlang/fix_gen_fsm_example/OTP-11472:
  fixed small typo (missing right parenthesis) in gen_fsm example
Merge branch 'maint'