Merge commit '9d2cee52d37c7340f85a5d41110282aac03e6855'

* commit '9d2cee52d37c7340f85a5d41110282aac03e6855':
  configure: Assume a standard-compliant default libc

See: 170e2fd7c3
Note, the change is not merged to avoid breaking netbsd and others.
once the netbsd (and any other breakages are dealt with the
else based solution could be used and 170e2fd7c3
could then be reverted)

Merged-by: Michael Niedermayer <michaelni@gmx.at>