Pass individual arguments in bindgen flags

Bindgen flags are now shell escaped, so we can't pass multiple distinct
arguments in the same argument string. Bindgen will parse each element
of the bindgen_flags list as an argument and fails to parse the flag if
it is separated from the value by whitespace. Bindgen accepts
--flag=value forms for its arguments, so we use these instead.

Test: m libselinux_bindgen
Change-Id: Ic0ca26b8a93547d8dc23087d9f7d414dfab341d6
1 file changed