Fix build problem on NetBSD, BSDmakefile no longer used
Dyncall v0.8 no longer uses a specific makefile for BSD (compare ChangeLog).
compile dyncall with -fPIC on NetBSD
This fixes a build problem on NetBSD.
It's the same fix as in commit 5ed99d26b3c3ac2d65bc622afdbd987a547046f5 for FreeBSD.
OpenBSD does not need CFLAGS=-fPIC (was able to build parrot and perl6-p on OpenBSD 5.5).
Merge pull request #183 from usev6/master

Fix parrot build problem on NetBSD (building of dyncall failed)