prefer PLIST_FILES and PORTDOCS to `dynamic plist'
use BINMODE rather than using INSTALL directly
PR: ports/148433
Submitted by: Anonymous <swell.k at gmail.com>
the ECHO macro is set to "echo" by default, but it is set to "true" if
make(1) is invoked with the -s option while ECHO_CMD is always set to
the echo command.
Use command macros where appropriate.