* automake.in (&read_am_file, &file_contents_internal): Don't

* automake.in (&read_am_file, &file_contents_internal): Don't
define macros when `FALSE', to avoid errors on doubly defined
variables but under condition `FALSE'.  In order to allow...
(&am_install_var): When reading the associated file for the first
time, enable `%?FIRST%'.
(&handle_libraries): Let libs.am define $(AR) and $(RANLIB).
* libs.am: Do it when `%?FIRST%'.