libc/glibc: commonalise extraction btw glibc and eglibc

glibc and eglibc have a very similar extraction process, so it
makes sense to commonalise it.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 reporter_name="YEM"

 reporter_url="http://ymorin.is-a-geek.org/"

 reporter_comment="Sample i586 configuration tweaked to generate code for the geode."