Remove WWW entries moved into port Makefiles
Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.
This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.
Approved by: portmgr (tcberner)
New port: graphics/gmt
The Generic Mapping Tools data processing and display
software package.
PR: ports/37972
Submitted by: Stefan `Sec` Zehl <sec@ice.42.org>