autoconf build: clean up Makefile, remove fish.spec

Removes some unused variables and out-of-date references.
Wraps some tests in quotes to avoid expansion errors.
Removes the fish.spec generated file as it is out of date and is
arguably better maintained by downstream packagers.
See http://github.com/zanchey/fish-build/ for a better RPM spec file.
add correct version number to manpage output