It would previously wrongly also catch function calls to function names
ending with 'return'
Amended test1185.
Reported-by: Stefan Eissing
Closes#15764
Move checksrc.pl, firefox-db2pem.sh and mk-ca-bundle.pl since they don't
particularly belong in lib/
Also created an EXTRA_DIST= in scripts/Makefile.am instead of specifying
those files in the root Makefile.am
Closes#8625