Added "exec" make target that works like this:
Added "exec" make target that works like this:

# make exec EXEC=<outputfilename>
cc -o <outputfilename> <outputfilename>.o exec_start.o blib/lib/libparrot.a -lm -lutil


git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@3869 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

tkob/parrot,youprofit/parrot,fernandobrito/parrot,parrot/parrot,gitster/parrot,tkob/parrot,tkob/parrot,gitster/parrot,parrot/parrot,tewk/parrot-select,tewk/parrot-select,gagern/parrot,gagern/parrot,gitster/parrot,fernandobrito/parrot,FROGGS/parrot,FROGGS/parrot,youprofit/parrot,parrot/parrot,fernandobrito/parrot,fernandobrito/parrot,gagern/parrot,tewk/parrot-select,tkob/parrot,gagern/parrot,tkob/parrot,tewk/parrot-select,gagern/parrot,youprofit/parrot,gagern/parrot,tewk/parrot-select,tkob/parrot,FROGGS/parrot,tkob/parrot,gitster/parrot,youprofit/parrot,gagern/parrot,FROGGS/parrot,youprofit/parrot,gitster/parrot,tewk/parrot-select,FROGGS/parrot,FROGGS/parrot,gitster/parrot,youprofit/parrot,parrot/parrot,gitster/parrot,youprofit/parrot,parrot/parrot,tkob/parrot,fernandobrito/parrot,fernandobrito/parrot,fernandobrito/parrot,FROGGS/parrot,tewk/parrot-select,youprofit/parrot,FROGGS/parrot