Change "Bootstrap" so that it will not fail on BK source trees of other versions; this is important because this 4.0 "Bootstrap" is the one generally used on host "build".
Change "Bootstrap" so that it will not fail on BK source trees of other versions;
this is important because this 4.0 "Bootstrap" is the one generally used on host "build".


Build-tools/Bootstrap:
  If the source tree does not contain any "Docs/Images/Makefile*" (due to an error,
  or because it is not yet prepared to contain the Images in the source tar-ball),
  a plain "rm" will fail and so cause "Bootstrap" to fail. (This has happened ...)
  Prevent this danger by using "rm -f".

flynn1973/mariadb-aix,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,flynn1973/mariadb-aix,davidl-zend/zenddbi,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,davidl-zend/zenddbi,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,slanterns/server,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,davidl-zend/zenddbi,davidl-zend/zenddbi,ollie314/server,ollie314/server,flynn1973/mariadb-aix,ollie314/server,ollie314/server,flynn1973/mariadb-aix,davidl-zend/zenddbi,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,flynn1973/mariadb-aix,natsys/mariadb_10.2,davidl-zend/zenddbi,natsys/mariadb_10.2,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,ollie314/server,natsys/mariadb_10.2,ollie314/server,flynn1973/mariadb-aix,ollie314/server