nasm.spec.in: need autoheader, use autogen.sh
nasm.spec.in: need autoheader, use autogen.sh

We need to use our new autogen.sh, which in turn needs autoheader.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm