Don't add -fPIC if already present.

diff -Naur --exclude=debian perl-5.8.8.orig/hints/linux.sh perl-5.8.8/hints/linux.sh
--- perl-5.8.8.orig/hints/linux.sh	2005-11-18 12:18:45.000000000 +1100
+++ perl-5.8.8/hints/linux.sh	2006-02-03 00:19:15.000000000 +1100
@@ -260,6 +260,7 @@
 sparc*)
 	case "$cccdlflags" in
 	*-fpic*) cccdlflags="`echo $cccdlflags|sed 's/-fpic/-fPIC/'`" ;;
+	*-fPIC*) ;;
 	*)	 cccdlflags="$cccdlflags -fPIC" ;;
 	esac
 	;;
