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
Approved by: portmgr (tcberner)
New port: GNU libmatheval.
GNU libmatheval is a library which contains several procedures that make
it possible to create an in-memory tree from the string representation
of a mathematical function over single or multiple variables. This tree
can be used later to evaluate a function for specified variable values,
to create a corresponding tree for the function derivative over a
specified variable or to write a textual tree representation to a
specified string. The library exposes C and Fortran 77 interfaces.