ninja: 1.5.3

notable changes:
- the bootstrap.py script is being retired, `configure.py --bootstrap` now does
  what bootstrap.py used to do

release note:
- https://groups.google.com/forum/#!topic/ninja-build/PHgWwy4DL0c

Closes #34447.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
ninja: update 1.5.3 bottle.
clamav 0.98.5

Version bump, fixed head, new optional dependency, moves the
sysconf dir to a directory inside HOMEBREW_PREFIX/etc to make it a
little tidier, adds some caveats to explain clamav’s confusing error
messages on initial run. Adds a test.

Closes #34403.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
clamav: update 0.98.5 bottle.