Prefer interpolation to concatenation
Simplify condition
leiningen 2.3.2

Closes #22136.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
gforth 0.7.2

Closes #22127.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
PythonInstalled, name includes modules

If `depends_on :python => ['modulename', :optional]` then the generated
option is now `--with-python-modulename`, so that it is possible to
actually make depending on python modules optional.
Further, `brew options` becomes more meaningful.