Log Message:
math/R: on NetBSD, disable the ntohl / htonl dance.

These are already declared at the point in the code it's used,
and on macppc it causes build failure, and probably also on other
big-endian targets.

There still appears to be rpath issues, libR.so is installed in
${PREFIX}/lib/R/lib/, but that directory is not in rpath of other
libs or executables, so this does not install, at least not on
macppc at the moment.

Bump PKGREVISION.