libresolv.a and libnsl.a

[Brazil]

On Debian and FreeBSD, TinyMUX doesn't need to link against these
libraries, so I've removed the following from configure.in/
configure.ac:

AC_CHECK_LIB(resolv, main)
AC_CHECK_LIB(nsl, main)

I'll build on other environments later to prove whether this is a good
idea or not, but if you feel like beating me to the punch, feel free.


Brazil

[Brazil]

TinyMUX on Solaris does not require libresolv.a, but it does need
libnsl.a, so we use the following:

case "$host" in
*solaris*) AC_CHECK_LIB(nsl, main)
;;
esac