ltcf-c.sh: Clear ac_cv_prog_cc_pic for DJGPP.

Re-installed:
2001-01-02  Laurynas Biveinis  <lauras@softhome.net>
* ltcf-c.sh: Clear ac_cv_prog_cc_pic for DJGPP.  Do not add
'-DPIC' to ac_cv_prog_cc_pic for DJGPP.
* ltcf-cxx.sh: Likewise.
* ltcf-gcj.sh: Likewise.

From-SVN: r40749