m4/check.m4: Hack around Debian/Ubuntu's broken installation of the PIC version of check as libcheck_pic.a. Should wo...

Original commit message from CVS:
2006-02-13  Andy Wingo  <wingo@pobox.com>

* m4/check.m4: Hack around Debian/Ubuntu's broken installation of
the PIC version of check as libcheck_pic.a. Should work with
cross-compilation too. Grr.