drop 'dist-shar', deprecated by newer automake
add 'has_undefined_symbols' property for libraries
* +python/patches/2.6.2-aix-sem.patch
* portage/patches/15-new-eprefix.patch:
* python/python.build:
* portage/patches/04-ebuildshell.patch
* python/python.build:
* eprefix-bootstrap/eprefix-bootstrap.build: