A formula should be built from source by default if the --cc option is
passed to specify a particular compiler.
Added a test to test_formula_installer: test_not_poured_from_bottle_when_compiler_specified
Modified test_formula_installer to assert that the formula was not poured
from a bottle. Similarly modified test_formula_installer_bottle to assert
that the formula *was* installed from a bottle.
Added an install method to the TestballBottle formula (the same as the
Testball formula's install method) so that the TestballBottle formula can
be "built from source".
FixesHomebrew/homebrew#46046 - Build from source should be the default behavior if --cc
option is passed
ClosesHomebrew/homebrew#46162.
Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
